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Re: A noisy pilot light !

 

Mike-VY FB OM! Guess our fathers were pretty smart after all!

?

73, Joe.

?

?

-----Original Message-----
From: <[email protected]>
Sent: Sep 30, 2022 10:31 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] A noisy pilot light !

?

Joe et al.

?

Another interesting tid bit of information regarding those incandescent light bulbs. ?I will make this “short” and interesting.

?

Many years ago back when I was a Tech in the service, there was an RT-524 that got passed around the shop as each Tech who tried to work on it was stumped.? The symptom was as soon as you turned it on it would trip its power switch, so there was a sort somewhere, but no could find it.? By the time it landed on my Test bench it had been through 4 other Techs all claiming it was a candidate for either Cannibalization or Depo. I worked on it for a day, got frustrated cause how could I not find a simple short.? So I put it off to the side for a couple of days in favor of some other jobs that were more pressing.? One night I woke up with an idea, actually it was a memory of something that happened to my father (Retired IBM FSE) while he was troubleshooting a Main Frame that was acting “funny” as he put it.? So that morning I put that radio back on my bench, pulled a brand new Dial Lamp from parts and replaced the old one.? As soon as I turned the power on, the radio came up just fine, passed all the receive and transmit tests.? Sure enough, that light bulb had a dead short.? When asked by the other techs what was the root cause, I told them sometimes you just have to think outside of the box and look where you least expect it.? That was one of the many lessons I learned from my father as I was growing up.

?

Thank you,

?

Mike

W5CUL

?

From: [email protected] <[email protected]> On Behalf Of Joe
Sent: Friday, September 30, 2022 6:43 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] A noisy pilot light !

?

Hi Jim,

Thanks for the info. Yep. I remember being surprised at the time.
I didn't realize an incandescent bulb could generate RF. This occurred
back in the 70's and there were no CFL or LED lights being used.
Again, thanks a lot OM.

73, Joe-WA9LAE.

?

?
Re: HX-40 & SX-140

 


3.885 and 7.290 are two good ones.
7.290 runs a "Lunchtime Forum Net" at about 1pm EDST
hosted by KC8ZUL.? 3.885 is pretty busy in the evenings,
depending where you are.

I had an HT-40(K), and it was pretty decent for Control
Carrier Mudulation -- Just don't drive it too hard.? With
a decent antenna, you'll do fine.? (Have a spare 6DQ5
around.? it's a "sweep tube," and doesn't like a lot of
continuous key-down poweer like AM.)

? 73
KW1B

From: "Dave via groups.io" <kc3am@...>
To: [email protected]
Sent: Friday, September 30, 2022 11:24:53 PM
Subject: [HallicraftersRadios] HX-40 & SX-140

Hello everyone,

I am trying to get my HT-40 & SX-140 on the air.

I do have the T/R relay working.
This is just a coax relay switching between the? TX & RX antenna ports.
My SX-140 has had a so-239 installed to use instead of the antenna screws.

I have output with a crystal.

I can't get the HA-5? to work with it.
I am confused with the pictures in the manuals as how to hook up the key
line from the HA-5.
I see there is +12vdc on the key line and I am not sure how to make this
all work.

My goal is to use this mostly on AM.
I need to find out where some of the AM operation is and see if any of
the crystals I have may be close.

Thanks much for any help,

Dave KC3AM

Re: A noisy pilot light !

 

开云体育

Joe et al.

?

Another interesting tid bit of information regarding those incandescent light bulbs. ?I will make this “short” and interesting.

?

Many years ago back when I was a Tech in the service, there was an RT-524 that got passed around the shop as each Tech who tried to work on it was stumped.? The symptom was as soon as you turned it on it would trip its power switch, so there was a sort somewhere, but no could find it.? By the time it landed on my Test bench it had been through 4 other Techs all claiming it was a candidate for either Cannibalization or Depo. I worked on it for a day, got frustrated cause how could I not find a simple short.? So I put it off to the side for a couple of days in favor of some other jobs that were more pressing.? One night I woke up with an idea, actually it was a memory of something that happened to my father (Retired IBM FSE) while he was troubleshooting a Main Frame that was acting “funny” as he put it.? So that morning I put that radio back on my bench, pulled a brand new Dial Lamp from parts and replaced the old one.? As soon as I turned the power on, the radio came up just fine, passed all the receive and transmit tests.? Sure enough, that light bulb had a dead short.? When asked by the other techs what was the root cause, I told them sometimes you just have to think outside of the box and look where you least expect it.? That was one of the many lessons I learned from my father as I was growing up.

?

Thank you,

?

Mike

W5CUL

?

From: [email protected] <[email protected]> On Behalf Of Joe
Sent: Friday, September 30, 2022 6:43 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] A noisy pilot light !

?

Hi Jim,

Thanks for the info. Yep. I remember being surprised at the time.
I didn't realize an incandescent bulb could generate RF. This occurred
back in the 70's and there were no CFL or LED lights being used.
Again, thanks a lot OM.

73, Joe-WA9LAE.


Virus-free.
HX-40 & SX-140

 

Hello everyone,

I am trying to get my HT-40 & SX-140 on the air.

I do have the T/R relay working.
This is just a coax relay switching between the? TX & RX antenna ports.
My SX-140 has had a so-239 installed to use instead of the antenna screws.

I have output with a crystal.

I can't get the HA-5? to work with it.
I am confused with the pictures in the manuals as how to hook up the key
line from the HA-5.
I see there is +12vdc on the key line and I am not sure how to make this
all work.

My goal is to use this mostly on AM.
I need to find out where some of the AM operation is and see if any of
the crystals I have may be close.

Thanks much for any help,

Dave KC3AM
Re: A noisy pilot light !

 

Hi Jim,

Thanks for the info. Yep. I remember being surprised at the time.
I didn't realize an incandescent bulb could generate RF. This occurred
back in the 70's and there were no CFL or LED lights being used.
Again, thanks a lot OM.

73, Joe-WA9LAE.
Re: A noisy pilot light !

 

For Joe WA9LAE and others who may find this interesting.?? It is possible for an incandescent lamp to generate RF.?? Here are a couple of links to discussions of the phenomenon:



Regards,

--
Jim T.
KB6GM
Re: S-40 Drifted Micas

 

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Mike,

?

Had a look at your QRZ page – you have a great collection of boat anchor awesomeness!? Like you, my restoration work is to keep me busy and out of trouble.? Based on the experience with the S-40, I’m going to have to revisit some of my favorite old receivers here and have a closer look at the micas.? That would include the micas in my HRO-60 and its coil packs (some of which lack sufficient sensitivity).? I occasionally write articles for ER magazine -- in light of all this, I’ve saved the micas, will cut them open, and write something up.? I think the time has come to dispense with the notion that the antique micas are generally infallible.

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of Mike <w5cul@...>
Reply-To: <[email protected]>
Date: Thursday, September 29, 2022 at 6:25 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Steve,

?

I have been working on these old radios off and on for many years, I just enjoy restoring the occasional old tube radio that peaks my interest.? And besides it keeps me busy and out of trouble.? As you said, when it comes to the Mica’s in those old tube radios, the word from those who have doing this a lot longer than me has always been do not waste your time with replacing the older rectangular encased (Domino) Micas, they are good.? Then this email thread pops up with some extremely knowledgeable gentlemen pitching in on the discussion with their findings as of late.? What made me stand up and take notice was the comment that one of those gentlemen made.? Not sure of the exact wording but the intent of his messages struck me in the head like a shalalie.? He indicated that yes the rule of thumb was do not bother replacing the old Mica’s, and that it was good advice back then as they have been burned in and will not drift outside of their rating.? However, he went on to say something about that advice is now over 40 to 50 years old, and as such is not good advice any longer.? This made me think of a radio that was built in the 1950’s, those micas in that radio have been around for over 70 years now, thus are now extremely suspect for all the varying reasons that others have pointed out and discussed in this thread.? So I am not afraid to admit it, this has been an eye opener for me as I guess I have been programed such that when I see one of those Domino Mica’s, I just arbitrarily skip over it.? Well, that is not going to happen any longer.? Guess I better increase my inventory of Dipped Silver Mica’s and get to soldering.

?

Thank you,

?

Mike

W5CUL

?

From: [email protected] <[email protected]> On Behalf Of KW4H via groups.io
Sent: Thursday, September 29, 2022 9:13 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

All very interesting info.? Well, one thing is absolutely for certain:? the days of “don’t touch that mica!” are over with (for me, anyway).? The drumbeat has been broken.? On forum after forum you’ll find comments from longtime experts who claim, with a wave of their flux-stained fingers, that replacing micas is a “waste of time” and the “work of the inexperienced”.? Well, I’ve got a collection of micas right here that proves that position wrong – and there are probably even more if you count the micas I ignored in a couple of other projects this year.? ?

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of "D. Platt" <jeepp@...>
Reply-To: <[email protected]>
Date: Thursday, September 29, 2022 at 4:14 AM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

My experience indicates a crap-shoot very often. One Hallicrafters BC-669 required a 100% recap. Another one was fine. My S-40B "appears" to be still perking along. I did have a mica go out in a BC-348R in the LO box. It coupled the variable cap into the circuit. Compressed the tuning range and took a while to find the problem. An APR-4 needed 100% tiny mica re-cap. Very poor components.? Persevere!!!

Jeep K3HVG

On 09/28/2022 11:31 PM Richard Knoppow <1oldlens1@...> wrote:

?

?

For a long time high quality mica caps were molded in bakelite , so called postage stamp capacitors. The bakelite can pass moisture allowing degradation of the dielectric. Some of the cases were sealed better than others. My guess is thT Hallictafters bought on the basis of price and left proof of performance to the manufacturer. Undoubtedly price was an important consideration.? ?We know now, decades later, that there was great variation in reliability and life expectancy.?

Mica caps were expected to be very long lived and reliable where the limitations of paper and electrolytic caps were well known and could be approximately? calculated.?

The bakelite caps were often dipped in wax which may have provided some immunity from moisture.? Modern caps are dipped in epoxy which provides a better seal.

Note that transmitting and some other? types of mica caps are not silver plated so do not get silver mica disease.? ?

Note that the failure mode of paper caps, however shaped,? is different being primarily a degradation of the dielectric itself, although often also due to moisture. This is somewhat like the effect that turns newsprint brown.?

BTW if the insides look like an oil filled paper cap that's probably what it is although it may look like a mica.?

?

?

?

?

?

?

?

-------- Original message --------

From: don Root <drootofallevil@...>

Date: 9/28/22 7:40 PM (GMT-08:00)

Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Thanks for reply Steve

So it would seem to be held in a fairly common environment.. so ??one wonders if Halligan bought micas from other supplier for a while .. so who knows?..so far a mystery … is it possible that your tester is very sensitive ?in the mica range??

Don VA3DRL

?

From: [email protected] [mailto:[email protected]] On Behalf Of KW4H via groups.io
Sent: Wednesday, September 28, 2022 6:51 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

I do know the history of this particular radio – it belongs to a lifelong friend, and it was originally purchased new by his grandfather and then passed on to his father and then to him.? It hasn’t been powered on for many years, but it’s been sitting in places like a closet shelf, or maybe an attic or a basement.? His father and grandfather have long since passed away, so no further details are available.? It has not been subjected to weather extremes to my knowledge.? I didn’t expect this quantity or severity of mica capacitor failure.

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Wednesday, September 28, 2022 at 2:36 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Out of interest for this and other radios, do you know the history of its environment .. as in temp and humidity ??

Don VA3DRL… ???catching up on emails

?

?

?

?

?

?

?

?

Virus-free.
Re: S-40 Drifted Micas

 

开云体育

Steve,

?

I have been working on these old radios off and on for many years, I just enjoy restoring the occasional old tube radio that peaks my interest.? And besides it keeps me busy and out of trouble.? As you said, when it comes to the Mica’s in those old tube radios, the word from those who have doing this a lot longer than me has always been do not waste your time with replacing the older rectangular encased (Domino) Micas, they are good.? Then this email thread pops up with some extremely knowledgeable gentlemen pitching in on the discussion with their findings as of late.? What made me stand up and take notice was the comment that one of those gentlemen made.? Not sure of the exact wording but the intent of his messages struck me in the head like a shalalie.? He indicated that yes the rule of thumb was do not bother replacing the old Mica’s, and that it was good advice back then as they have been burned in and will not drift outside of their rating.? However, he went on to say something about that advice is now over 40 to 50 years old, and as such is not good advice any longer.? This made me think of a radio that was built in the 1950’s, those micas in that radio have been around for over 70 years now, thus are now extremely suspect for all the varying reasons that others have pointed out and discussed in this thread.? So I am not afraid to admit it, this has been an eye opener for me as I guess I have been programed such that when I see one of those Domino Mica’s, I just arbitrarily skip over it.? Well, that is not going to happen any longer.? Guess I better increase my inventory of Dipped Silver Mica’s and get to soldering.

?

Thank you,

?

Mike

W5CUL

?

From: [email protected] <[email protected]> On Behalf Of KW4H via groups.io
Sent: Thursday, September 29, 2022 9:13 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

All very interesting info.? Well, one thing is absolutely for certain:? the days of “don’t touch that mica!” are over with (for me, anyway).? The drumbeat has been broken.? On forum after forum you’ll find comments from longtime experts who claim, with a wave of their flux-stained fingers, that replacing micas is a “waste of time” and the “work of the inexperienced”.? Well, I’ve got a collection of micas right here that proves that position wrong – and there are probably even more if you count the micas I ignored in a couple of other projects this year.? ?

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of "D. Platt" <jeepp@...>
Reply-To: <[email protected]>
Date: Thursday, September 29, 2022 at 4:14 AM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

My experience indicates a crap-shoot very often. One Hallicrafters BC-669 required a 100% recap. Another one was fine. My S-40B "appears" to be still perking along. I did have a mica go out in a BC-348R in the LO box. It coupled the variable cap into the circuit. Compressed the tuning range and took a while to find the problem. An APR-4 needed 100% tiny mica re-cap. Very poor components.? Persevere!!!

Jeep K3HVG

On 09/28/2022 11:31 PM Richard Knoppow <1oldlens1@...> wrote:

?

?

For a long time high quality mica caps were molded in bakelite , so called postage stamp capacitors. The bakelite can pass moisture allowing degradation of the dielectric. Some of the cases were sealed better than others. My guess is thT Hallictafters bought on the basis of price and left proof of performance to the manufacturer. Undoubtedly price was an important consideration.? ?We know now, decades later, that there was great variation in reliability and life expectancy.?

Mica caps were expected to be very long lived and reliable where the limitations of paper and electrolytic caps were well known and could be approximately? calculated.?

The bakelite caps were often dipped in wax which may have provided some immunity from moisture.? Modern caps are dipped in epoxy which provides a better seal.

Note that transmitting and some other? types of mica caps are not silver plated so do not get silver mica disease.? ?

Note that the failure mode of paper caps, however shaped,? is different being primarily a degradation of the dielectric itself, although often also due to moisture. This is somewhat like the effect that turns newsprint brown.?

BTW if the insides look like an oil filled paper cap that's probably what it is although it may look like a mica.?

?

?

?

?

?

?

?

-------- Original message --------

From: don Root <drootofallevil@...>

Date: 9/28/22 7:40 PM (GMT-08:00)

Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Thanks for reply Steve

So it would seem to be held in a fairly common environment.. so ??one wonders if Halligan bought micas from other supplier for a while .. so who knows?..so far a mystery … is it possible that your tester is very sensitive ?in the mica range??

Don VA3DRL

?

From: [email protected] [mailto:[email protected]] On Behalf Of KW4H via groups.io
Sent: Wednesday, September 28, 2022 6:51 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

I do know the history of this particular radio – it belongs to a lifelong friend, and it was originally purchased new by his grandfather and then passed on to his father and then to him.? It hasn’t been powered on for many years, but it’s been sitting in places like a closet shelf, or maybe an attic or a basement.? His father and grandfather have long since passed away, so no further details are available.? It has not been subjected to weather extremes to my knowledge.? I didn’t expect this quantity or severity of mica capacitor failure.

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Wednesday, September 28, 2022 at 2:36 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Out of interest for this and other radios, do you know the history of its environment .. as in temp and humidity ??

Don VA3DRL… ???catching up on emails

?

?

?

?

?

?

?


Virus-free.
Re: A noisy pilot light !

 

?
A filament in a lamp, generally isn't noisy unless the filament is broken or it's touching something conductive.
If there is some material like paper based phenolic in the lamp holder, phenolic will absorb the Deoxit and make?the phenolic?somewhat conductive. After applying Deoxit sparingly on a terminal, I always wipe the entire area shortly there after.
?
Pete, wa2cwa
?
?
On Thu, 29 Sep 2022 16:50:58 -0700 "momnpear" <pearsrepairs@...> writes:

That is an odd one. I put Deoxit on bulb bases when installing and on the crimp tang if it’s one of those slip on lamp holders
I did a very early Zenith console for a lady and when I delivered it I warned her that dimmers, walkways, chargers could be a problem. Sure enough , every lamp she had was on a dimmer so we listened to radio by candlelight
Re: A noisy pilot light !

 

That is an odd one. I put Deoxit on bulb bases when installing and on the crimp tang if it’s one of those slip on lamp holders
I did a very early Zenith console for a lady and when I delivered it I warned her that dimmers, walkways, chargers could be a problem. Sure enough , every lamp she had was on a dimmer so we listened to radio by candlelight

Sent from my alternate universe
Re: S-40 Drifted Micas

 

开云体育

Whoops!? Yeah – meant to say that my LCR meter has been ruled out.? I can put one of the old micas and the replacement side-by-side.? The meter measures the replacement right on the money, and the old one is WAY out of whack.

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Thursday, September 29, 2022 at 3:22 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

What I read is likely not what you meant.. I expect you mean ?“I’ve ruled OUT my LCR meter as a problem”.

Good for the meter, not good for the radio , and likely not good for all our radios.

The sudden rash in? failures must be due to global weather going berserk ?I guess.

Don VA3DRL ??

?

From: [email protected] [mailto:[email protected]] On Behalf Of KW4H via groups.io
Sent: Wednesday, September 28, 2022 10:46 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Well, testing many other capacitors in the same range (including the replacements for this bad micas) has proven to be accurate, so I’ve ruled my LCR meter as a problem.

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Wednesday, September 28, 2022 at 7:40 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Thanks for reply Steve

So it would seem to be held in a fairly common environment.. so ??one wonders if Halligan bought micas from other supplier for a while .. so who knows?..so far a mystery … is it possible that your tester is very sensitive ?in the mica range??

Don VA3DRL

?

?

?
Re: S-40 Drifted Micas

 

开云体育

What I read is likely not what you meant.. I expect you mean ?“I’ve ruled OUT my LCR meter as a problem”.

Good for the meter, not good for the radio , and likely not good for all our radios.

The sudden rash in? failures must be due to global weather going berserk ?I guess.

Don VA3DRL ??

?

From: [email protected] [mailto:[email protected]] On Behalf Of KW4H via groups.io
Sent: Wednesday, September 28, 2022 10:46 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Well, testing many other capacitors in the same range (including the replacements for this bad micas) has proven to be accurate, so I’ve ruled my LCR meter as a problem.

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Wednesday, September 28, 2022 at 7:40 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Thanks for reply Steve

So it would seem to be held in a fairly common environment.. so ??one wonders if Halligan bought micas from other supplier for a while .. so who knows?..so far a mystery … is it possible that your tester is very sensitive ?in the mica range??

Don VA3DRL

?

?
Re: FOR SALE: HT32B/SX115

 


I use a couple of layers of foam insulation to pack anything more than a few pounds.? Never have had a problem or complaint.

John WD5ENU?

On Wed, Aug 10, 2022 at 18:56 Mike <w5cul@...> wrote:

When I received my SR-2000 from the gentleman in Rhode Island via UPS and opened the box, it was surrounded by sheets of polystyrene foam that were cut to fit perfectly, bottom, sides and top. There was at least an inch and a half of this stuff between the box and the radio, and it was packed such that the radio had no play/movement within the box.? It was like disassembling a 3 dimensional puzzle that is put together only one way.? For the P-2000, I found the same thing, the only difference was that the bottom of the power supply was also mounted to a sheet of plywood and below that was some more polystyrene sheets. Needless to say, both units arrived in excellent shape regardless of what nefarious things may have happened along the way.

?

This certainly had me thinking about how we pack these things when we do ship them.? As sellers, the biggest concern that we all seem to share is what kind of damage could happen when shipping a heavy boat anchor through the standard shippers.? And that actually stops some of us from even considering shipping such a rig thus we ask for local sales which limits our potential buyer pool.? Now as buyers, such thoughts of possible shipping damage can and does keep us up at nights while waiting for that highly anticipated boat anchors arrival.? With that thought in mind, I have come to the conclusion that usage of polystyrene foam within a heavy duty oversized box is definitely in my future when shipping such items.? I may even toy with the idea of custom cutting and fitting ?” sheets of plywood, or maybe thinner, to place along the inside exterior walls between the box and the polystyrene foam as well, given how a forklift driver is just concerned with getting things unloaded as quickly as possible. Yes, I understand this will add weight and cost to the shipping, but that can be advertised/negotiated with the buyer as part of the shipping expense.? One would assume, or at least hope that the buyer is of the same mind set as we the sellers are and would feel more comfortable knowing it is well protected and be willing to pay the extra expense for such peace of mind.? I certainly was when he explained how he would pack for the shipping of the SR-2000 and P-2000 from Rhode Island to Texas.

?

Just food for thought and or discussion.

?

Thank you,

?

Mike

W5CUL

?

From: [email protected] <[email protected]> On Behalf Of k7wxk
Sent: Tuesday, August 9, 2022 9:07 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] FOR SALE: HT32B/SX115

?

Tnx, I pack myself. Never had an item damaged yet. Knock on wood.

?

On Tue, Aug 9, 2022, 7:03 AM Tom Dailey <radio@...> wrote:

WARNING… WARNING… a friend just received a Drate TR-4C and AC-3 p/s that FedX was PAID to packup…the morons shipped them both in ONE box, and used “bubble wrap”…? needless to say, the radio was a fright when received as well as having the umbilical cable cut as well! ?(also with a hole in the side of the box).

?

Pack them YOURSELF!

?

Tom W?EAJ

?

From: [email protected] [mailto:[email protected]] On Behalf Of k7wxk
Sent: Friday, August 5, 2022 8:27 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] FOR SALE: HT32B/SX115

?

I have decided to ship this combo to the lower 48, but it will be expensive. I will ship the tx and rx in separate boxes via FedEx ground. Shipping to mid America from Oregon is around $180 for the transmitter and $100 for the receiver. Exact costs will be determined by location. Hope this encourages more interest without scaring too many off. Shipping is the bane of the boat anchor trader these days.


Virus-free.
Re: S-40 Drifted Micas

 

开云体育

All very interesting info.? Well, one thing is absolutely for certain:? the days of “don’t touch that mica!” are over with (for me, anyway).? The drumbeat has been broken.? On forum after forum you’ll find comments from longtime experts who claim, with a wave of their flux-stained fingers, that replacing micas is a “waste of time” and the “work of the inexperienced”.? Well, I’ve got a collection of micas right here that proves that position wrong – and there are probably even more if you count the micas I ignored in a couple of other projects this year.? ?

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of "D. Platt" <jeepp@...>
Reply-To: <[email protected]>
Date: Thursday, September 29, 2022 at 4:14 AM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

My experience indicates a crap-shoot very often. One Hallicrafters BC-669 required a 100% recap. Another one was fine. My S-40B "appears" to be still perking along. I did have a mica go out in a BC-348R in the LO box. It coupled the variable cap into the circuit. Compressed the tuning range and took a while to find the problem. An APR-4 needed 100% tiny mica re-cap. Very poor components.? Persevere!!!

Jeep K3HVG

On 09/28/2022 11:31 PM Richard Knoppow <1oldlens1@...> wrote:

?

?

For a long time high quality mica caps were molded in bakelite , so called postage stamp capacitors. The bakelite can pass moisture allowing degradation of the dielectric. Some of the cases were sealed better than others. My guess is thT Hallictafters bought on the basis of price and left proof of performance to the manufacturer. Undoubtedly price was an important consideration.? ?We know now, decades later, that there was great variation in reliability and life expectancy.?

Mica caps were expected to be very long lived and reliable where the limitations of paper and electrolytic caps were well known and could be approximately? calculated.?

The bakelite caps were often dipped in wax which may have provided some immunity from moisture.? Modern caps are dipped in epoxy which provides a better seal.

Note that transmitting and some other? types of mica caps are not silver plated so do not get silver mica disease.? ?

Note that the failure mode of paper caps, however shaped,? is different being primarily a degradation of the dielectric itself, although often also due to moisture. This is somewhat like the effect that turns newsprint brown.?

BTW if the insides look like an oil filled paper cap that's probably what it is although it may look like a mica.?

?

?

?

?

?

?

?

-------- Original message --------

From: don Root <drootofallevil@...>

Date: 9/28/22 7:40 PM (GMT-08:00)

Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Thanks for reply Steve

So it would seem to be held in a fairly common environment.. so ??one wonders if Halligan bought micas from other supplier for a while .. so who knows?..so far a mystery … is it possible that your tester is very sensitive ?in the mica range??

Don VA3DRL

?

From: [email protected] [mailto:[email protected]] On Behalf Of KW4H via groups.io
Sent: Wednesday, September 28, 2022 6:51 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

I do know the history of this particular radio – it belongs to a lifelong friend, and it was originally purchased new by his grandfather and then passed on to his father and then to him.? It hasn’t been powered on for many years, but it’s been sitting in places like a closet shelf, or maybe an attic or a basement.? His father and grandfather have long since passed away, so no further details are available.? It has not been subjected to weather extremes to my knowledge.? I didn’t expect this quantity or severity of mica capacitor failure.

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Wednesday, September 28, 2022 at 2:36 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Out of interest for this and other radios, do you know the history of its environment .. as in temp and humidity ??

Don VA3DRL… ???catching up on emails

?

?

?

?

?

?

?
Re: S-40 Drifted Micas

 

My experience indicates a crap-shoot very often. One Hallicrafters BC-669 required a 100% recap. Another one was fine. My S-40B "appears" to be still perking along. I did have a mica go out in a BC-348R in the LO box. It coupled the variable cap into the circuit. Compressed the tuning range and took a while to find the problem. An APR-4 needed 100% tiny mica re-cap. Very poor components.? Persevere!!!
Jeep K3HVG

On 09/28/2022 11:31 PM Richard Knoppow <1oldlens1@...> wrote:


For a long time high quality mica caps were molded in bakelite , so called postage stamp capacitors. The bakelite can pass moisture allowing degradation of the dielectric. Some of the cases were sealed better than others. My guess is thT Hallictafters bought on the basis of price and left proof of performance to the manufacturer. Undoubtedly price was an important consideration.? ?We know now, decades later, that there was great variation in reliability and life expectancy.?
Mica caps were expected to be very long lived and reliable where the limitations of paper and electrolytic caps were well known and could be approximately? calculated.?
The bakelite caps were often dipped in wax which may have provided some immunity from moisture.? Modern caps are dipped in epoxy which provides a better seal.
Note that transmitting and some other? types of mica caps are not silver plated so do not get silver mica disease.? ?
Note that the failure mode of paper caps, however shaped,? is different being primarily a degradation of the dielectric itself, although often also due to moisture. This is somewhat like the effect that turns newsprint brown.?
BTW if the insides look like an oil filled paper cap that's probably what it is although it may look like a mica.?







-------- Original message --------
From: don Root <drootofallevil@...>
Date: 9/28/22 7:40 PM (GMT-08:00)
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

Thanks for reply Steve

So it would seem to be held in a fairly common environment.. so ??one wonders if Halligan bought micas from other supplier for a while .. so who knows?..so far a mystery … is it possible that your tester is very sensitive ?in the mica range??

Don VA3DRL

?

From: [email protected] [mailto:[email protected]] On Behalf Of KW4H via groups.io
Sent: Wednesday, September 28, 2022 6:51 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas


I do know the history of this particular radio – it belongs to a lifelong friend, and it was originally purchased new by his grandfather and then passed on to his father and then to him.? It hasn’t been powered on for many years, but it’s been sitting in places like a closet shelf, or maybe an attic or a basement.? His father and grandfather have long since passed away, so no further details are available.? It has not been subjected to weather extremes to my knowledge.? I didn’t expect this quantity or severity of mica capacitor failure.

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Wednesday, September 28, 2022 at 2:36 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Out of interest for this and other radios, do you know the history of its environment .. as in temp and humidity ??

Don VA3DRL… ???catching up on emails

?


?
Re: A noisy pilot light !

 

开云体育

Agreed, Bill,

But it was just a GE made incandescent one !

Not sure it was as old as the receiver, however…

?

73, Jacques, VE2JFE in Montreal

?

If those pilot lights were or are not incandescent but LED replacements they would be very noisy on an AC source.

K2WH

?
Re: Paypal (taxman at Dayton.)

 

开云体育

Yeah, I never thought about that...guess I'm behind the times

Tom L

On 9/28/2022 20:49, don Root wrote:

I guess? all other classes? got of Scott-free,? so you need to reclassify yourself to avoid the taxes.?? It seems that the number of classes is rising by the day.

Anominus ?don

?

From: [email protected] [mailto:[email protected]] On Behalf Of Thomas Latimer
Sent: Tuesday, September 27, 2022 8:10 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Paypal (taxman at Dayton.)

?

Well, I had heard there were two distinct classes of people who disliked paying taxes......MEN and WOMEN

Tom Latimer


On 9/27/2022 19:13, Peter A Markavage wrote:

?

I? remember when getting my Dayton vendor packet of papers and forms, there were several pages associated with getting a temporary weekend Tax ID number from the Ohio Tax people. So collecting Sales tax was not new at Dayton. I started vendoring in 1988.

?

Pete, wa2cwa

?

?

On Sun, 25 Sep 2022 14:52:29 +0000 (UTC) "mecomberd via groups.io" <mecomberd@...> writes:

I must have missed that year at Dayton. (have been going since 1985)

Same thing occurred at Rochester, NY, at "Dome arena". Taxman had Sherrif deputy w/him, you had to have visible tax form,

or close up, or be arrested! Shut down fest, was when the fest was becoming a 3 day affair. Never recovered.?

The "taxman" was subsequently reassigned to location unknown!

?Dale, N2DM,??

?

?
Re: Paypal (taxman at Dayton.)

 

So was the sales tax for a new item or used item?
Re: S-40 Drifted Micas

 

开云体育

For a long time high quality mica caps were molded in bakelite , so called postage stamp capacitors. The bakelite can pass moisture allowing degradation of the dielectric. Some of the cases were sealed better than others. My guess is thT Hallictafters bought on the basis of price and left proof of performance to the manufacturer. Undoubtedly price was an important consideration.? ?We know now, decades later, that there was great variation in reliability and life expectancy.?
Mica caps were expected to be very long lived and reliable where the limitations of paper and electrolytic caps were well known and could be approximately? calculated.?
The bakelite caps were often dipped in wax which may have provided some immunity from moisture.? Modern caps are dipped in epoxy which provides a better seal.
Note that transmitting and some other? types of mica caps are not silver plated so do not get silver mica disease.? ?
Note that the failure mode of paper caps, however shaped,? is different being primarily a degradation of the dielectric itself, although often also due to moisture. This is somewhat like the effect that turns newsprint brown.?
BTW if the insides look like an oil filled paper cap that's probably what it is although it may look like a mica.?





-------- Original message --------
From: don Root <drootofallevil@...>
Date: 9/28/22 7:40 PM (GMT-08:00)
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

Thanks for reply Steve

So it would seem to be held in a fairly common environment.. so ??one wonders if Halligan bought micas from other supplier for a while .. so who knows?..so far a mystery … is it possible that your tester is very sensitive ?in the mica range??

Don VA3DRL

?

From: [email protected] [mailto:[email protected]] On Behalf Of KW4H via groups.io
Sent: Wednesday, September 28, 2022 6:51 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

I do know the history of this particular radio – it belongs to a lifelong friend, and it was originally purchased new by his grandfather and then passed on to his father and then to him.? It hasn’t been powered on for many years, but it’s been sitting in places like a closet shelf, or maybe an attic or a basement.? His father and grandfather have long since passed away, so no further details are available.? It has not been subjected to weather extremes to my knowledge.? I didn’t expect this quantity or severity of mica capacitor failure.

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Wednesday, September 28, 2022 at 2:36 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Out of interest for this and other radios, do you know the history of its environment .. as in temp and humidity ??

Don VA3DRL… ???catching up on emails

?

?

?
Re: S-40 Drifted Micas

 

开云体育

Well, testing many other capacitors in the same range (including the replacements for this bad micas) has proven to be accurate, so I’ve ruled my LCR meter as a problem.

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Wednesday, September 28, 2022 at 7:40 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Thanks for reply Steve

So it would seem to be held in a fairly common environment.. so ??one wonders if Halligan bought micas from other supplier for a while .. so who knows?..so far a mystery … is it possible that your tester is very sensitive ?in the mica range??

Don VA3DRL

?

From: [email protected] [mailto:[email protected]] On Behalf Of KW4H via groups.io
Sent: Wednesday, September 28, 2022 6:51 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

I do know the history of this particular radio – it belongs to a lifelong friend, and it was originally purchased new by his grandfather and then passed on to his father and then to him.? It hasn’t been powered on for many years, but it’s been sitting in places like a closet shelf, or maybe an attic or a basement.? His father and grandfather have long since passed away, so no further details are available.? It has not been subjected to weather extremes to my knowledge.? I didn’t expect this quantity or severity of mica capacitor failure.

?

73 – Steve, KW4H

?

From: <[email protected]> on behalf of don Root <drootofallevil@...>
Reply-To: <[email protected]>
Date: Wednesday, September 28, 2022 at 2:36 PM
To: <[email protected]>
Subject: Re: [HallicraftersRadios] S-40 Drifted Micas

?

Out of interest for this and other radios, do you know the history of its environment .. as in temp and humidity ??

Don VA3DRL… ???catching up on emails

?

?

?

?

?

?
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