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Re: How to Getter a 3CX-3000A7 / 6000 / 10,000 , etc !

 

On Sep 24, 2006, at 2:18 AM, pentalab wrote:

After all that discussion on the ...'other reflector' about
gettering tubes, I thought I'd add my 2 cents worth.

After reading about the detailled gettering info on Svetlana's
website years ago... I made some enquires.

Svetlana depicted the 4 x getter's on ur typ thoriated
tungsten tubes [metal monsters] as 4 x discs... located at the
TOP of the tube [the pix they had was with the anode cooler
removed].

The 4 x getter's are HEAT activated by the FILAMENT !

I was gonna fire up the filament and blower [NO HV]... and let
it run at rated fil V [measured right at the socket] for a
good 8 [EIGHT] hours.

I use 1-2.5 mh chokes... one per leg.. located right at the
fil lugs to measure fil V. The test leads are brought up to
both a 0-10 vac panel meter... and also some banana jacks [so my
Fluke 87 can be used as well] . I used a 1 k resistor in each
leg + .01 uf bypass cap's at the panel meter/banana jacks. If
the jacks, etc were ever shorted... the resistors would limit
the current.

Then came a ton of e-mail from Economy Electronics + some
amp builders plus a load of 11m QRO builders.

Apparently.... the real method is to run just the filament[s]
{NO HV] for a SOLID 48 hours !!! They all told me my
origional 8 hr plan was flawed... and they had all gone through
this dozens and dozens of times.

After the 48 hrs is up.... HV + drive can be applied.
Do getters stop working when the HV is applied? ... when the drive is applied? ... or when both are applied?

ANY and
all residual gas and junk is absorbed by the getter's... and
you will never get any surprises... like any arcing from
anode to the grounded grid !!
I've fired up several gassy tubes, the insides glowed blue, but none of them arced to the grid.

...
R L MEASURES, AG6K. 805-386-3734
r@...
Re: Silicone Rubber

PA3DUV
 

开云体育

Jim,
?
Between my remote 3 phase 400 VAC primary HT PSU (in the garage) and the RF deck in the shack I run 25 ft silicone insulated high voltage cable as used in the neon lighting industry.
Around that silicone cable a braid of an RG213 cable and a heat shrink tubing outside sheat is used. The HT cable is subject to 3.2 kV @ 3.5 amps in real life.
?
The HT cable runs inside of a PVC pipe which is casted into the concrete ceiling in my garage.
?
Parallel to the HT cable there is a control cable for: B+ voltage metering, plate current metering, AMP?on/off, DC ground, AC neutral and?one 400 VAC phase to power the filament transformer and the fans in the RF deck.
?
See the pictures in the picture section.
Posting pictures on the
is easy. Just go there and click create album (top right)
?
Cheers, Dick
PA3DUV
?
?
?

----- Original Message -----
From: pentalab
Sent: Sunday, September 24, 2006 10:18 AM
Subject: [ham_amplifiers] Silicone Rubber

I have been using Belden 10 KV test prod wire for the last
several years.... comes in red/black. I use both red/black on
everything......... vey flexible.... abot .21" diam.... silicone
rubber. Many fine strands inside. Test V is 29 kv.

Funny thing is, the smaller 5 kv test prod wire has a test V
of 20 kv.... go figure.

My real concern using this stuff EXTERNALLY like between RF
deck and HV supply... or HV supply to an external cap box is
it would appear to be very easy for something to cut through
it. It needs to be re enforced on the outside.

Back in 1976... our local emporium had 40 kv stuff.... but had a
solid teflon dielectric... was stranded inside... and NOT very
flexible.

Anybody know the V rating on RG-303 TEFLON coax ???

My other idea was to place the Belden 10 kv silicone test prod
wire INSIDE some plastic tubing. I also saw VERY flexible
aluminium BX sheath material at home depot. Also saw the
flexible plastic tubing with the slit all the way through
it... to make life easier getting wiring inside it.

I have seen some fellows place the HV supply very close to
the main 200 A breaker panel..... then run longer lengths of
HV wiring... sometimes inside conduit... to the remoted RF
deck. The idea there was to minimize V drops in the 240 wiring.

The peak current every 8.3 msecs in the 240 V ac line is
unreal.... like almost 4-6 X.

Later...... Jim VE7RF
How to Getter a 3CX-3000A7 / 6000 / 10,000 , etc !

pentalab
 

After all that discussion on the ...'other reflector' about
gettering tubes, I thought I'd add my 2 cents worth.

After reading about the detailled gettering info on Svetlana's
website years ago... I made some enquires.

Svetlana depicted the 4 x getter's on ur typ thoriated
tungsten tubes [metal monsters] as 4 x discs... located at the
TOP of the tube [the pix they had was with the anode cooler
removed].

The 4 x getter's are HEAT activated by the FILAMENT !

I was gonna fire up the filament and blower [NO HV]... and let
it run at rated fil V [measured right at the socket] for a
good 8 [EIGHT] hours.

I use 1-2.5 mh chokes... one per leg.. located right at the
fil lugs to measure fil V. The test leads are brought up to
both a 0-10 vac panel meter... and also some banana jacks [so my
Fluke 87 can be used as well] . I used a 1 k resistor in each
leg + .01 uf bypass cap's at the panel meter/banana jacks. If
the jacks, etc were ever shorted... the resistors would limit
the current.

Then came a ton of e-mail from Economy Electronics + some
amp builders plus a load of 11m QRO builders.

Apparently.... the real method is to run just the filament[s]
{NO HV] for a SOLID 48 hours !!! They all told me my
origional 8 hr plan was flawed... and they had all gone through
this dozens and dozens of times.

After the 48 hrs is up.... HV + drive can be applied. ANY and
all residual gas and junk is absorbed by the getter's... and
you will never get any surprises... like any arcing from
anode to the grounded grid !!

My buddy [who I designed the 3CX-6000A7 for] followed the 48
hour sequence on a Svetlana 6000A7.... and we never have
experience any arcing, or other anomolies... yet.

I had him install a new hour meter on the primary of the Dahl
filament xfmr.

I thought the 48 hour gettering process was.. 'pie in the
sky'... but it worked very well. I figured if a ton of
fellows had allready experimented with various.. 'gettering
times'.... and all had reached this 48 hour min conclusion, who
was I to question it.

They all told me this process pertains to both brand new
tubes.. and also rebuilt ones you get back from Eimac / Econco.

Just to recap... it's 48 hrs... with rated fil V [measured
right at the socket], blower on.. NO HV.

I have never had a 3000/6000 arc.... yet.

Now, I dunno about tubes that went through the 48 hr
process.... then down the road... were pulled from service.. and
onto the shelf for a few years. I'd be inclined to re-
getter em again for another 48 hrs... prior to application of
B+ and applying drive.

later.... Jim VE7RF
Re: Jumbo sized lytic stack for HV supplies ! Oil cap warning. DIODES

pentalab
 

--- In ham_amplifiers@..., Frank Goenninger <frgo@...>
wrote:


Am 24.09.2006 um 09:52 schrieb pentalab:
### Millens are fine up to 5 kv. For the 5-10 kv stuff....
I'm going to go to a better connector.
Which ones would these be?
### Probably either Alden or Kings or Rowe. All 3 x brands
have good connectors rated at 25 kv and more. These red/black
Millen's are just too mickey mouse. The Phenolic material
will eventually absorb moisture.

### Perhaps a google on... " High Voltage connector's" will turn
up some answers........ it usually does.

later........ Jim VE7RF



I have found Huber+Suhner (Switzerland) but their SHV type
connector
is rated at 3.5 kV rms / 5 kV DC only.

connectors/
hs-p-rf-con-gr/hs-p-rf-con-gr-series/hs-p-rf-con-gr-series-shv.htm

73, Frank DG1SBG
Re: Jumbo sized lytic stack for HV supplies ! Oil cap warning. DIODES

PA3DUV
 

开云体育

Also the SHV will accept?RG8U coax only.
Actually the H+S SHV is the same type as the Kings HT connectors, a bit flimsy.
I just browsed the ? site. (Thanks Greg!)
These look better to me, are mechanical sound, accept 11/12 mm coax as well and can be supplied with nice bend restrictors.
?
Cheers, Dick
PA3DUV
?
?

----- Original Message -----
Sent: Sunday, September 24, 2006 10:10 AM
Subject: Re: [ham_amplifiers] Jumbo sized lytic stack for HV supplies ! Oil cap warning. DIODES


Am 24.09.2006 um 09:52 schrieb pentalab:
> ### Millens are fine up to 5 kv. For the 5-10 kv stuff....
> I'm going to go to a better connector.
Which ones would these be?

I have found Huber+Suhner (Switzerland) but their SHV type connector
is rated at 3.5 kV rms / 5 kV DC only.


hs-p-rf-con-gr/hs-p-rf-con-gr-series/hs-p-rf-con-gr-series-shv.htm

73, Frank DG1SBG
Silicone Rubber

pentalab
 

I have been using Belden 10 KV test prod wire for the last
several years.... comes in red/black. I use both red/black on
everything......... vey flexible.... abot .21" diam.... silicone
rubber. Many fine strands inside. Test V is 29 kv.

Funny thing is, the smaller 5 kv test prod wire has a test V
of 20 kv.... go figure.

My real concern using this stuff EXTERNALLY like between RF
deck and HV supply... or HV supply to an external cap box is
it would appear to be very easy for something to cut through
it. It needs to be re enforced on the outside.

Back in 1976... our local emporium had 40 kv stuff.... but had a
solid teflon dielectric... was stranded inside... and NOT very
flexible.

Anybody know the V rating on RG-303 TEFLON coax ???

My other idea was to place the Belden 10 kv silicone test prod
wire INSIDE some plastic tubing. I also saw VERY flexible
aluminium BX sheath material at home depot. Also saw the
flexible plastic tubing with the slit all the way through
it... to make life easier getting wiring inside it.

I have seen some fellows place the HV supply very close to
the main 200 A breaker panel..... then run longer lengths of
HV wiring... sometimes inside conduit... to the remoted RF
deck. The idea there was to minimize V drops in the 240 wiring.

The peak current every 8.3 msecs in the 240 V ac line is
unreal.... like almost 4-6 X.

Later...... Jim VE7RF
Re: Jumbo sized lytic stack for HV supplies ! Oil cap warning. DIODES

Frank Goenninger
 

Am 24.09.2006 um 09:52 schrieb pentalab:
### Millens are fine up to 5 kv. For the 5-10 kv stuff....
I'm going to go to a better connector.
Which ones would these be?

I have found Huber+Suhner (Switzerland) but their SHV type connector is rated at 3.5 kV rms / 5 kV DC only.

hs-p-rf-con-gr/hs-p-rf-con-gr-series/hs-p-rf-con-gr-series-shv.htm

73, Frank DG1SBG
Re: More QRO secrets revealed.... 15 -20 kw baluns !! - Pictures, PLEASE

Frank Goenninger
 

Am 24.09.2006 um 09:38 schrieb pentalab:

--- In ham_amplifiers@..., Frank Goenninger <frgo@...>
wrote:
### I'm going to attempt to post some pix in the photo area..
IF I can figure it out. I'm no PC geek. Worse comes....
I'll e-mail some to u direct.

Jim
Thanks, Jim! If you want me to post them in this group at yahoo please let me know!

Meanwhile I was able to find a movie on WWW showing you in the shack with some pictures of homebrew stuff. I especially love that photo with the cat. Hi-Hi!

73, Frank
Re: Fw: Jumbo sized lytic stack for HV supplies ! Oil cap warning. DIODES

pentalab
 

--- In ham_amplifiers@..., "Mike Sawyer" <w3slk@...>
wrote:

Let me correct this:



Jim said: This is my "external cap box". I used Millen Red/ Black
HV
connector's on it. IF using the Millen's.... either use
nylon mounting screws or mount em on Micarta. Both Kings and
ROWE make better HV connector's imo.

Where can one find the Kings or Rowe connectors?
#### Try a google on kings or rowe. SSON has some.... so
does Jerry Thompson at Economy electronics... in Loanoke Ark.
He has a website too. ..think it's Economyelectronics.com



The only thing I have in my junk box are the Millen Red and the
brown phenolic. I understand the brown ones *aren't* very good.

## They are not. Only use the red/black ones.


However, my local parts jobber confided in me that the Millen
connectors were supposedly rated for 4500 VDC.

### Millen rates em at 7 kv. U HAVE to mount em from the
inside to use em at high V. Mount em on the outside.... and
I had one arc to the chassis once... and another arc to the
machine screw holding the millen down.

## Trbl with mounting em on the inside is... with 1/8" thick
panels I use... the mating screw on connector will butt up
against the panel 1st.

## If u mounted em on insulating material... they would never
arc.

### If the RF deck/HV supply is all in one box.... don't mess
with connectors... just hardwire everything with sta-kons
[solder em, as well as crimp em] on each end.. and heat shrink.

### Millens are fine up to 5 kv. For the 5-10 kv stuff....
I'm going to go to a better connector.

Later..........Jim VE7RF


Mod-U-Lator,
Mike(y)
W3SLK
Re: More QRO secrets revealed.... 15 -20 kw baluns !! - Pictures, PLEASE

pentalab
 

--- In ham_amplifiers@..., Frank Goenninger <frgo@...>
wrote:


Am 23.09.2006 um 15:41 schrieb pentalab:

I couldn't resist.
I'm dying to see some beautiful pictures of all those neat things
you
describe... Please be so kind and put some into the photos area
of
this group on yahoo.

Mni tnx de Frank DG1SBG
### I'm going to attempt to post some pix in the photo area..
IF I can figure it out. I'm no PC geek. Worse comes....
I'll e-mail some to u direct.

Jim
Re: More QRO secrets revealed.... 15 -20 kw baluns !!

pentalab
 

--- In ham_amplifiers@..., "Paul Christensen"
<pchristensen@...> wrote:

The boys on the contest reflector finally figured out the same
thing. The typ W2DU baluns using 303 teflon coax.. and the
tiny type 75 beads would heat up with just a 500 w dead cxr on
all bands from 1.8 to 30 mhz. They switched to type 43
small beads... and the same small 303 teflon coax.[slightly
longer.. more beads] They ran the exact same test as b4.....
except 2200 watts.... zero heat ! ..."

Jim, I like air wound baluns best. But as you point out, the
geometries can oftentimes get in the way. In the alternative, I
have successfully used a combination of #43 and #77 material on RG-
214. The #43 material is used on the ends with #77 beads sandwiched
in between over a distance of ~ 60 inches. That can create some
weight and manipulation problems too. In that case, it's tough to
beat the W1JR or W2FMI technique of winding RG-303 (at 1.5KW level)
onto large #31 mix cores. I believe the DX-Engineering baluns are
constructed this way.

Paul, W9AC
#### Tnx Paul. The W1JR baluns on Array Solutions site are
rated at 5 kw....... which is the rating of 303 @ 10 mhz !

### Z goes up to the square of the turns. Of course...
winding 393 on a torroid is impossible...... hence sliding beads
over 393.

### Some have experimented with type 43 beads at the ant end....
followed by type 77. It's the beads closest to the ant feedpoint
that are gonna heat up.

### The weight/bulk/windload of solenoid coax wound baluns is
a
real pig. I'd never do it again.

Later.....Jim VE7RF
Re: Fw: Jumbo sized lytic stack for HV supplies ! Oil

PA3DUV
 

开云体育

Greg,
?
Thanks for info.
Your statement on the Powerpoles for HT use is amazing. Did you test the small Powerpoles (30-45 amp) or the larger 75 amp models?
?
One thing is very important though; for HT connectors, beside the HT rating, it is VERY important to have the connector arranged in such a way that ground makes contact long before B+ in order to prevent the RF deck to become on B+ potential any time. I cannot see a Powerpole meeting this.
?
Also I use a second ground connection from the HT psu to the RF deck. This ground connection is wired in the control cable connector and provides the needed redundancy.
?
Cheers, Dick
PA3DUV
?
?
?
?
?
?

----- Original Message -----
Sent: Sunday, September 24, 2006 2:42 AM
Subject: Re: Fw: [ham_amplifiers] Jumbo sized lytic stack for HV supplies ! Oil

--- In ham_amplifiers@yahoogroups.com, "Mike Sawyer" wrote:
>
> Let me correct this:
>
>
>
> Jim said: This is my "external cap box". I used Millen Red/ Black HV
> connector's on it. IF using the Millen's.... either use
> nylon mounting screws or mount em on Micarta. Both Kings and
> ROWE make better HV connector's imo.
>
> Where can one find the Kings or Rowe connectors? The only thing I
have in my junk box are the Millen Red and the brown phenolic. I
understand the brown ones *aren't* very good. However, my local parts
jobber confided in me that the Millen connectors were supposedly rated
for 4500 VDC.
> Mod-U-Lator,
> Mike(y)
> W3SLK
>
Hi Mike

Lemo make some very good HV connectors, but they expensive.

www.lemo.com

The look similar in construction to Canon connectors however they use
high grade materials. The company that i work for manufactures
industrial rf heaters and they have moved away from using connectors
in all forms for HF and HV. Direct connections out in the field has
proven the most reliable. M6 Studs are now routinely used for all HV
and RF connections, all bolted with stainless hardware.

I have had a lot of Luck using the HV PIGTAIL sets from Surplus
sales. I cant think of the brand name, i think these are the same
brand that Rich Measures has suggeted in the past. They might be Alden
i am not too sure.

Having access to a 50KV AC DC Lab grade highpot its amazing what
materials will withstand even if they not high voltage rated.
Personally i would not be to fussed about using a homebrew connector.

I have been Anderson Powerpoles mounted in Wine Barrels Bungs. The
wine barrel bungs are the best grade silicon rubber you can buy. You
can turn these down and mount the male/female andersons in them. I
could not make these flash over at 30 KV @ 1amp! I did not pursue
testing over 30kv because tracking and leaking can confuse the
measurments, i would say its safe even for tube with handle amplifers.

High grade silicon rubber wire rated at 30kv was used for these
connectors. I routinely pull these live from a 7kv power supply,
however i always play it safe and use electricians 45 kv live line
working gloves. I dont want to be a victim of Murphy!

Greg
Re: HIGH SWR / HIGH REFLECTED POWER SHUT DOWN CIRCUIT !!

 

On Sep 23, 2006, at 3:31 PM, Tony King - W4ZT wrote:

R L Measures wrote:
<snip>

Lifting an 85lb transformer is not easy for this old fart.
A small fold up Engine Lift can solve that and many other heavy lifting
jobs. One of these helped me lift my mill and lathe when I brought them
home and I have a 164 lb Peter Dahl to move too ;)
I used a sledge hammer handle, a strap, a hook, helper-girl on one end of the handle, and me on the other end to lift it in place.

73, Tony W4ZT




Yahoo! Groups Links









R L MEASURES, AG6K. 805-386-3734
r@...
Re: HIGH SWR / HIGH REFLECTED POWER SHUT DOWN CIRCUIT !!

Tony King - W4ZT
 

R L Measures wrote:
<snip>
Lifting an 85lb transformer is not easy for this old fart.
A small fold up Engine Lift can solve that and many other heavy lifting jobs. One of these helped me lift my mill and lathe when I brought them home and I have a 164 lb Peter Dahl to move too ;)

73, Tony W4ZT
Re: HIGH SWR / HIGH REFLECTED POWER SHUT DOWN CIRCUIT !!

craxd
 

Dick,

You can buy a 1-2 ton chain fall hoist from harbor Freight for about
$40.00. One can mount this in the ceiling stationary by the hook, and
pull a pick up truck under it allowing the lift (if the ceiling is
high enough). It takes about the same amount of room as a come-a-long,
but is way easier to use. One can build some dollys to set the
equipment on and move it around the shop where ever you want.
Actually, One could mount the hoist outside to get it higher in the
air for a larger truck if you have a hard top or corcrete drive way to
roll the dolly on. They also make a set of wheels that riggers use to
move heavy machinery the same way. You can sometimes find them on ebay
at a cheap price.

If I was to use a hoist of any kind, I'd strongly recommend obtaining
a small I beam about 8 inches high at least, and set it atop two walls
to carry the load. Then mount the hoist to it. You can run these
between ceiling joists and set the ends on top of the sill plate. A
lot of the time, you can buy one cut new pretty cheap. A scrap yard is
another place to look. You only need one about the size that some
place over double-car garage doors in place of a header when they use
brick.

A luxury is to get is a small fork lift if you have a garage. Here,
they come in at the local two scrap yards all the time. To be honest,
there's not much wrong with some. A buddy of mine who owns a small
machine shop bought one from one of the yards that was electric and
they threw in a charger. I rebuilt the drive board and got it going. I
think he got it for $0.08 a pound which was $0.02 over what they paid.
I think it was one by Yale, however it was white in color. They are
very nice if your going to be doing a lot of heavy lifting. You can
mount a boom on the forks and you have a built in crane. I ran my
welding/repair portion of my machine shop with two lift trucks this
way.

Best,

Will



--- In ham_amplifiers@..., PA3DUV <pa3duv@...> wrote:

Lifting an 85lb transformer is not easy for this old fart.
I just put an M24 2 metric tonne lifting eye on a 1ft studbolt
through the steel reinforced concrete ceiling of my garage to get the
30 kVA 1500 rpm diesel genset and HT power supply on and off the
trailer. Using a chain come along even a physically challenged person
like the undersigned can do the job ;-)

Cheers, Dick
PA3DUV



----- Original Message -----
From: R L Measures
To: ham_amplifiers@...
Sent: Saturday, September 23, 2006 1:37 PM
Subject: Re: [ham_amplifiers] Re: HIGH SWR / HIGH REFLECTED POWER
SHUT DOWN CIRCUIT !!



On Sep 23, 2006, at 1:35 AM, pentalab wrote:

> --- In ham_amplifiers@..., PA3DUV <pa3duv@> wrote:
>>
>> Great info Jim!
>> NOW we're talking amplifiers ;-)
>>
>> This yahoo group has the possibility of posting pictures, files
and
> the like. Some pics of your "QRP" amps (They also make the usual
10
> kw 5 kw.. 2.5 kw qrp slugs.) would be very much appreciated.
>>
>> Thanks again for the very interesting contributions!
>>
>> Cheers, Dick
>> PA3DUV
>
> ### Tnx Dick..... As soon as I can figure out this pix posting
> deal... We will try and get some pix up.
>
> ### Just to set the record straight. I design this QRO stuff
> [including everything downstream like baluns, LC networks for
> stacked arrays, etc, for ... "clients" [who will remain
> nameless for obvious reasons]
>
> ### IMO.... I could care less how one gets their ERP. 1500w
> into stacked yagi's is... "OK".... but 5 kw into a dipole is
> a "no-no" ..gimme a break !
>
> ### These 1500-2000w amps just bore me to tears. IMO... it's
> just as easy to build a big one as a small one.

Lifting an 85lb transformer is not easy for this old fart.

> To me, it's an
> engineering challenge.

Indeed.

> ... since you will never read any... "how to
> build a 5-15 kw linear" in any ARRL hand book / QST article.

The laugher is that W1AW had an Alpha 2, 8877 amplifier until the
ARRL sold it to because it had a habit of zapping 8877s. The
purchaser of the amplifier, QST Editor Mark Wilson, installed a
low
VHF-Q parasitic suppressors and apparently put the amplifier to
good
use.
>
> ### When AES / RF Parts / Coaxial Dynamics tell me they
> sell 10 kw slugs like popcorn.... it's blatantly obvious this
> QRO scenario is, and always has been.. alive and well.
>
> ### Eimac tells me their is this... "secret world wide
> underground network of QRO amp bulders ".... so secret.. they
> don't even know each other !!
>
> ### For a laff... check out JA6TAY's site. He doesn't mess
about.
>
>
> ### Well, the cat's out of the bag now ! I fully intend to post
> as much of these "trade secrets" as I can. None of it is
> rocket science really.

Amen to that.

> It starts off as an engineering
> problem... reverts to a... "sizing issue" then back to an
> engineering issue.
>
> ### All as it amounts to is ... either using bigger
> components.... or doing stuff like paralleling 8 x 200pf @ 15
> kv HEC ceramic doorknobs to make a plate block cap assy.

With one or two thousand ohms of of RL, 1600pF is not necessary
for
the DC blocker cap at MF/HF.
>
...

cheers, Jim

R L MEASURES, AG6K. 805-386-3734
r@...
Re: Jumbo sized lytic stack for HV supplies ! Oil cap warning. DIODES

PA3DUV
 

开云体育

Mike,
?
I bought a bunch of these SHV connectors and bulkheads from Powell, a Kings stockist/distributor. rmilligan@...? , Ryan Milligan from Powell was kind enough to send a handul of these conector over the pond to The Lowlands.
?
However, I do not like them. They are in physical terms too flimsy and do not accept?a 11 mm coaxial cable for HT connection purposes. Currently my 3 phase HT psu is connected to the desktop RF deck wit a silicone insulated coaxial cable which is hard wired on the choke in the amp and on the cap stack in the 3 phase HT psu.
?
Cheers, Dick
PA3DUV
?
.

----- Original Message -----
Sent: Saturday, September 23, 2006 10:29 PM
Subject: Fw: [ham_amplifiers] Jumbo sized lytic stack for HV supplies ! Oil cap warning. DIODES

Let me correct this:
?

Jim said: This is my "external cap box". I used Millen Red/ Black HV
connector's on it. IF using the Millen's.... either use
nylon mounting screws or mount em on Micarta. Both Kings and
ROWE make better HV connector's imo.

Where can one find the Kings or Rowe connectors? The only thing I have in my junk box are the Millen Red and the brown phenolic. I understand the brown ones *aren't* very good. However, my local parts jobber confided in me that the Millen connectors were supposedly rated for 4500 VDC.
Mod-U-Lator,
Mike(y)
W3SLK
Re: HIGH SWR / HIGH REFLECTED POWER SHUT DOWN CIRCUIT !!

PA3DUV
 

开云体育

> Lifting an 85lb transformer is not easy for this old fart.
?
I just put an M24 2 metric tonne lifting eye on a?1ft studbolt through the steel reinforced concrete ceiling of my garage to get the 30 kVA 1500 rpm diesel genset and HT power supply on and off the trailer. Using a chain come along even a physically challenged person like the undersigned can do the job ;-)
?
Cheers, Dick
PA3DUV
?
?
?

----- Original Message -----
Sent: Saturday, September 23, 2006 1:37 PM
Subject: Re: [ham_amplifiers] Re: HIGH SWR / HIGH REFLECTED POWER SHUT DOWN CIRCUIT !!


On Sep 23, 2006, at 1:35 AM, pentalab wrote:

> --- In ham_amplifiers@yahoogroups.com, PA3DUV wrote:
>>
>> Great info Jim!
>> NOW we're talking amplifiers ;-)
>>
>> This yahoo group has the possibility of posting pictures, files and
> the like. Some pics of your "QRP" amps (They also make the usual 10
> kw 5 kw.. 2.5 kw qrp slugs.) would be very much appreciated.
>>
>> Thanks again for the very interesting contributions!
>>
>> Cheers, Dick
>> PA3DUV
>
> ### Tnx Dick..... As soon as I can figure out this pix posting
> deal... We will try and get some pix up.
>
> ### Just to set the record straight. I design this QRO stuff
> [including everything downstream like baluns, LC networks for
> stacked arrays, etc, for ... "clients" [who will remain
> nameless for obvious reasons]
>
> ### IMO.... I could care less how one gets their ERP. 1500w
> into stacked yagi's is... "OK".... but 5 kw into a dipole is
> a "no-no" ..gimme a break !
>
> ### These 1500-2000w amps just bore me to tears. IMO... it's
> just as easy to build a big one as a small one.

Lifting an 85lb transformer is not easy for this old fart.

> To me, it's an
> engineering challenge.

Indeed.

> ... since you will never read any... "how to
> build a 5-15 kw linear" in any ARRL hand book / QST article.

The laugher is that W1AW had an Alpha 2, 8877 amplifier until the
ARRL sold it to because it had a habit of zapping 8877s. The
purchaser of the amplifier, QST Editor Mark Wilson, installed a low
VHF-Q parasitic suppressors and apparently put the amplifier to good
use.
>
> ### When AES / RF Parts / Coaxial Dynamics tell me they
> sell 10 kw slugs like popcorn.... it's blatantly obvious this
> QRO scenario is, and always has been.. alive and well.
>
> ### Eimac tells me their is this... "secret world wide
> underground network of QRO amp bulders ".... so secret.. they
> don't even know each other !!
>
> ### For a laff... check out JA6TAY's site. He doesn't mess about.
>
>
> ### Well, the cat's out of the bag now ! I fully intend to post
> as much of these "trade secrets" as I can. None of it is
> rocket science really.

Amen to that.

> It starts off as an engineering
> problem... reverts to a... "sizing issue" then back to an
> engineering issue.
>
> ### All as it amounts to is ... either using bigger
> components.... or doing stuff like paralleling 8 x 200pf @ 15
> kv HEC ceramic doorknobs to make a plate block cap assy.

With one or two thousand ohms of of RL, 1600pF is not necessary for
the DC blocker cap at MF/HF.
>
...

cheers, Jim

R L MEASURES, AG6K. 805-386-3734
r@...
Fw: Jumbo sized lytic stack for HV supplies ! Oil cap warning. DIODES

Mike Sawyer
 

开云体育

Let me correct this:
?

Jim said: This is my "external cap box". I used Millen Red/ Black HV
connector's on it. IF using the Millen's.... either use
nylon mounting screws or mount em on Micarta. Both Kings and
ROWE make better HV connector's imo.

Where can one find the Kings or Rowe connectors? The only thing I have in my junk box are the Millen Red and the brown phenolic. I understand the brown ones *aren't* very good. However, my local parts jobber confided in me that the Millen connectors were supposedly rated for 4500 VDC.
Mod-U-Lator,
Mike(y)
W3SLK
Re: Jumbo sized lytic stack for HV supplies ! Oil cap warning. DIODES

Mike Sawyer
 

开云体育

Jim said: This is my "external cap box". I used Millen Red/ Black HV
connector's on it. IF using the Millen's.... either use
nylon mounting screws or mount em on Micarta. Both Kings and
ROWE make better HV connector's imo.

Where can one find the Kings or Rowe connectors? The only thing I have in my junk box are the Millen Red and the brown phenolic. I understand the brown ones are very good. However, my local parts jobber confided in me that the Millen connectors were supposedly rated for 4500 VDC.
Mod-U-Lator,
Mike(y)
W3SLK
Re: More QRO secrets revealed.... 15 -20 kw baluns !! - Pictures, PLEASE

Frank Goenninger
 

Am 23.09.2006 um 15:41 schrieb pentalab:

I couldn't resist.
I'm dying to see some beautiful pictures of all those neat things you describe... Please be so kind and put some into the photos area of this group on yahoo.

Mni tnx de Frank DG1SBG
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