Re: Need 2 Tube Shields for SX-17
You are correct. ? The original tubes (Glass), were replaced by me with metal. ? K2WH ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE
Sent: Monday, November 14, 2022 4:38 PM
To: [email protected]
Cc: 'Richard Knoppow'
Subject: Re: [HallicraftersRadios] Need 2 Tube Shields for SX-17
Importance: High? Hi Bill, ? I believe that the situation is simple… Most probably you replaced, a while ago, the original 6J7G and 6R7G with their “metal envelope” counterparts, and the grid caps cannot be connected to the metal tubes with the external shield in place because the wire is too short for this… In all the metal envelope tubes, the envelope itself is the shield and is connected to pin 1. With the “G” or “GT” variants, nothing is connected to pin 1 and they require an external shield, like the one in the pictures you sent. So if the tube sockets pin 1 goes to GND inside the chassis, you do not need the external shields anymore (other than for cosmetic purposes). ? A WARNING however ! Some radios using the “G” tube variants (like the WS #19 from WWII) needed the external shields to work properly and the pin 1 of their sockets was connected to the + 270V, being used as +B distribution tie points. Some people plugged in the metal variants instead (6K7, 6K8, 6B8) because they were more “available”, thereby connecting the +B to the metal tubes envelope. I let you figure what happened when they were touched with the power applied… ? BTW, 6J7G and 6R7G tubes are available here: ? ? 73, Jacques, VE2JFE in Montreal ? ? Was looking inside my SX-17 and I noticed 2 of the tubes, were lacking their tube shields.? I could have sworn they were there years ago so where are they ?
Looked into my box of tubes and sure enough, there are the 2 tubes shields.? Brought them over to the rig to put them in but they are too tall for me to connect the grid cap, wires are too short.
Really ?? I went back into my photos archives and found a picture I took of the inside chassis years ago, and sure enough, there? are the 2 tubes with their shields.
So upon putting the shields in, I found the grid cap wires are too short ????? I'm wondering how this is possible when my old images show them on the tubes with the wires connected.
So, I am thinking there were 2 different size tube shields, basically shorter ones and the two I have are not from the SX-17 I have.
I have attached 2 images.? One taken with the tube shield on (far corner ) and the other without.? I'm starting to think it might be easier to just extend the wires from under the chassis or there actually were shorter tube shields.? The tube id's 6J7 & 6R7.
K2WH
-- K2WH
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Re: Need 2 Tube Shields for SX-17
The G types were first.? These are the large "semi-pear-shape" common to the pre-octal base tubes.? GT or "glass tubular"? were next but I don't have a date.? ThenRCA.RC-14 handbook, dated 1940, has all three.? I am not sure metal tubes were in short supply during the war, the shells were steel and it was.mostly copper and its alloys and aluminum that were statigic materials.? GT tubes and the similar local tubes were certainly made before the war. I don't know why Hallicrafters used G tubes.
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-------- Original message -------- From: Jacques_VE2JFE <jacques.f@...> Date: 11/14/22 1:43 PM (GMT-08:00) Subject: Re: [HallicraftersRadios] Need 2 Tube Shields for SX-17
Hi Richard, ? The metal envelope tubes in 1935, (by RCA) right. The “G” (glass) variants came during WWII because they were less expensive to produce than the full metal shell ones. The GT variants came at the end of the war and in the following ‘50s. ? 73, Jacques, VE2JFE in Montreal
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Re: Need 2 Tube Shields for SX-17
Ah, yes, let me correct myself here: the G and GT variants were available BEFORE the beginning of WWII. 1936 and 1938, respectively. Relating to that, the chapters 13 and 14 of John Stokes excellent book “70 years of radio tubes and valves” worth a good reading. ? 73, Jacques, VE2JFE in Montreal ? ? I am curious what the tube types are.? Many tubes were made in all three forms.
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Re: Need 2 Tube Shields for SX-17
I am curious what the tube types are.? Many tubes were made in all three forms.
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-------- Original message -------- From: "Bill (Group Owner)" <k2wh@...> Date: 11/14/22 1:35 PM (GMT-08:00) Subject: Re: [HallicraftersRadios] Need 2 Tube Shields for SX-17
Yep, went through more images and you can plainly see, the original tubes were glass. I don't need the shields but I have two if anyone is interested. :) --
K2WH
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Re: Need 2 Tube Shields for SX-17
Hi Richard, ? The metal envelope tubes in 1935, (by RCA) right. The “G” (glass) variants came during WWII because they were less expensive to produce than the full metal shell ones. The GT variants came at the end of the war and in the following ‘50s. ? 73, Jacques, VE2JFE in Montreal
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Re: Need 2 Tube Shields for SX-17
Hi Bill, ? I believe that the situation is simple… Most probably you replaced, a while ago, the original 6J7G and 6R7G with their “metal envelope” counterparts, and the grid caps cannot be connected to the metal tubes with the external shield in place because the wire is too short for this… In all the metal envelope tubes, the envelope itself is the shield and is connected to pin 1. With the “G” or “GT” variants, nothing is connected to pin 1 and they require an external shield, like the one in the pictures you sent. So if the tube sockets pin 1 goes to GND inside the chassis, you do not need the external shields anymore (other than for cosmetic purposes). ? A WARNING however ! Some radios using the “G” tube variants (like the WS #19 from WWII) needed the external shields to work properly and the pin 1 of their sockets was connected to the + 270V, being used as +B distribution tie points. Some people plugged in the metal variants instead (6K7, 6K8, 6B8) because they were more “available”, thereby connecting the +B to the metal tubes envelope. I let you figure what happened when they were touched with the power applied… ? BTW, 6J7G and 6R7G tubes are available here: ? ? 73, Jacques, VE2JFE in Montreal ? ? Was looking inside my SX-17 and I noticed 2 of the tubes, were lacking their tube shields.? I could have sworn they were there years ago so where are they ?
Looked into my box of tubes and sure enough, there are the 2 tubes shields.? Brought them over to the rig to put them in but they are too tall for me to connect the grid cap, wires are too short.
Really ?? I went back into my photos archives and found a picture I took of the inside chassis years ago, and sure enough, there? are the 2 tubes with their shields.
So upon putting the shields in, I found the grid cap wires are too short ????? I'm wondering how this is possible when my old images show them on the tubes with the wires connected.
So, I am thinking there were 2 different size tube shields, basically shorter ones and the two I have are not from the SX-17 I have.
I have attached 2 images.? One taken with the tube shield on (far corner ) and the other without.? I'm starting to think it might be easier to just extend the wires from under the chassis or there actually were shorter tube shields.? The tube id's 6J7 & 6R7.
K2WH
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Re: Need 2 Tube Shields for SX-17
Yep, went through more images and you can plainly see, the original tubes were glass.
I don't need the shields but I have two if anyone is interested. :)
--
K2WH
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Re: Need 2 Tube Shields for SX-17
Of course they don't need shields because they are metal, they are naturally shielded, DUH for me !
It is possible when I received the radio there were glass tubes in there originally and were taller hence, the need for shields.
Thanks.
K2WH
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Re: Need 2 Tube Shields for SX-17
Photo shows metal tubes.? They don't need shields.? Perhaps the original tubes were the larger glass (G) type,? enough taller for the caps to extend over the shields. Outlines in an older RCA tube handbook would tell you. I don't know the relative dates of the tubes but it seems to me metal tubes first appeared about 1935.? Don't know about G and GT tubes.
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-------- Original message -------- From: "Bill (Group Owner)" <k2wh@...> Date: 11/14/22 1:00 PM (GMT-08:00) Subject: [HallicraftersRadios] Need 2 Tube Shields for SX-17
Was looking inside my SX-17 and I noticed 2 of the tubes, were lacking their tube shields.? I could have sworn they were there years ago so where are they ? Looked into my box of tubes and sure enough, there are the 2 tubes shields.? Brought them over to the rig to put them in but they are too tall for me to connect the grid cap, wires are too short. Really ?? I went back into my photos archives and found a picture I took of the inside chassis years ago, and sure enough, there? are the 2 tubes with their shields. So upon putting the shields in, I found the grid cap wires are too short ????? I'm wondering how this is possible when my old images show them on the tubes with the wires connected. So, I am thinking there were 2 different size tube shields, basically shorter ones and the two I have are not from the SX-17 I have. I have attached 2 images.? One taken with the tube shield on (far corner ) and the other without.? I'm starting to think it might be easier to just extend the wires from under the chassis or there actually were shorter tube shields.? The tube id's 6J7 & 6R7.
K2WH
|
Need 2 Tube Shields for SX-17
Was looking inside my SX-17 and I noticed 2 of the tubes, were lacking their tube shields.? I could have sworn they were there years ago so where are they ?
Looked into my box of tubes and sure enough, there are the 2 tubes shields.? Brought them over to the rig to put them in but they are too tall for me to connect the grid cap, wires are too short.
Really ?? I went back into my photos archives and found a picture I took of the inside chassis years ago, and sure enough, there? are the 2 tubes with their shields.
So upon putting the shields in, I found the grid cap wires are too short ????? I'm wondering how this is possible when my old images show them on the tubes with the wires connected.
So, I am thinking there were 2 different size tube shields, basically shorter ones and the two I have are not from the SX-17 I have.
I have attached 2 images.? One taken with the tube shield on (far corner ) and the other without.? I'm starting to think it might be easier to just extend the wires from under the chassis or there actually were shorter tube shields.? The tube id's 6J7 & 6R7.
K2WH
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The HA-16 is the VOX adaptor for the SR-160 and SR-500. It mounts on the rear of the unit. That is what those funny little holes in the top left side of the back of the case are there for.
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
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Wow, HA-16???? What the heck is and HA-16 ?
Had to look that one up in Dachis's book.? Good luck.
K2WH
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Wow, HA-16???? What the heck is an HA-16 ?
Had to look that one up in Dachis's book.? Good luck.
K2WH
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I am looking for an HA-16 to complete a SR-500 system.
It does not need?to be functional, as long?as it is not chopped up.
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
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I looked closer now at the SX-42 PANEL: the front panels on others have 4 screw holes on each side for the fastening to the cabinet and? there is about 3/4 inch from the knob edge to the front panel edge, but in this one somebody has butchered the front panel [must have cut the edges with screw holes off] to "fit" that HP? cabinet...? that hurts.
don?? VA3DRL
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Hallicrafter Hurricane listed on QRZ
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That screw on the right panel edge looks half way into the cabinet too … strange ..POOR OLD HALLI Don VA3DRL ?
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Agree the cabinet looks HP-like, and especially with that defining trim ring. So similar in appearance to my old HP-606A - a great shop heater in the winter.
Dan
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On Nov 11, 2022, at 8:17 PM, Richard Knoppow <1oldlens1@...> wrote:
? The knobs don't look right either.? The cabinet looks almost like a Hewlett packard case. Maybe something cobbled together by the prop department.
-------- Original message -------- From: n7qmm25 <n7qmm25@...> Date: 11/11/22 4:25 PM (GMT-08:00) Subject: Re: [HallicraftersRadios] Hallicrafters on TV
The face is similar but the cabinet is wrong. The cabinet on mine
has the screen top that is hinged at the rear. The SX62 still had
the screen top on the cabinet.
On 11/11/2022 3:26 PM, Robert Eckweiler
wrote:
Happened to be watching an old episode of 77 Sunset Strip (I
believe the episode was Season 5 Episode 27 titled "Target
Island") and in it was what I believe is an SX-42 receiver. It was
up close. Attached is a screen shot I was fast enough to snap with
my phone.
Later on they showed a Heathkit GW-10 CB radio in the same
episode.
Bob, AF6C
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The knobs don't look right either.? The cabinet looks almost like a Hewlett packard case. Maybe something cobbled together by the prop department.
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-------- Original message -------- From: n7qmm25 <n7qmm25@...> Date: 11/11/22 4:25 PM (GMT-08:00) Subject: Re: [HallicraftersRadios] Hallicrafters on TV
The face is similar but the cabinet is wrong. The cabinet on mine
has the screen top that is hinged at the rear. The SX62 still had
the screen top on the cabinet.
On 11/11/2022 3:26 PM, Robert Eckweiler
wrote:
Happened to be watching an old episode of 77 Sunset Strip (I
believe the episode was Season 5 Episode 27 titled "Target
Island") and in it was what I believe is an SX-42 receiver. It was
up close. Attached is a screen shot I was fast enough to snap with
my phone.
Later on they showed a Heathkit GW-10 CB radio in the same
episode.
Bob, AF6C
|
In the movie Sky Captain and the World of Tomorrow, in the first few minutes, there is a very good image of an SX model on a table being used (I think) as a transmitter.
K2WH
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Interesting!? It looks like a hybrid TV studio prop – bits and pieces of Hallicrafters, combined with something else.? If I recall correctly, this was done deliberately in TV shows and movies so that the studios couldn’t be accused of being a marketing arm of one company or another.? Surprised they left the Hallicrafters logo on the dial! ? 73 – Steve, KW4H ? Happened to be watching an old episode of 77 Sunset Strip (I believe the episode was Season 5 Episode 27 titled "Target Island") and in it was what I believe is an SX-42 receiver. It was up close. Attached is a screen shot I was fast enough to snap with my phone.
Later on they showed a Heathkit GW-10 CB radio in the same episode.
Bob, AF6C
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Bill (Group Owner)
Jacques_VE2JFE
waltcates
don Root