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Re: [Amps] GS35B Plate connection suggestions wanted

To: "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] GS35B Plate connection suggestions wanted
From: jan <jan@on6zg.be>
Date: Sun, 06 Feb 2005 11:44:57 +0100
List-post: <mailto:amps@contesting.com>
HI,

I made a 144mhz Pa with a hoseclamp. On my HF PA i used a copper strap,
you can see it on my webpage. www.on6zg.be
I have an original hat for a gs35b tube, but i haven´t used it in any of
my Pa´s, because it covers a part of the cooling elements. I´ll make a
picture of it when i get my digital camera back from the repair shop.

73 Jan, ON6ZG

jeff millar schreef:

Tomm, George, et al...

If heat expands the anode cooler, it does not cause stress on the the GS-35b, because the the heat sink is completely above the tube's metal to ceramic seal.

It took a while to find the page you might have meant...maybe this one? That design looks over complicated to me, and more applicable to neutralized 20 dB tubes with handles than with 13 dB grounded grid triodes.
http://www.somis.org/D-a-11.GIF


Here's some pictures similar to the suggestion to use a hose clamp...found on http://nd2x.net web site.

The amp I built was for 432 MHz...like this one.
http://www.cworthy.net/kl6m/gs35b/choke.jpg

Other Amps with hose clamps
http://nd2x.net/PA3CSG.html
http://nd2x.net/k8cu/amp-2d1.jpg
http://nd2x.net/vk8rh/6m-grid-mount.jpg
http://www.dg2kbc.de/pics/tube_top_b.jpg

The hard way to do a clamp...maybe Russian original??
http://nd2x.net/ea3axv/gen-2b.jpg

Here's a semi-comercial amp using the stainless steel clamp technique
http://www.pa7ta.com/432MHz%20RF-Deck.htm

In fairness...wb8wju has a neat idea for HF amps...similar to an anode cap.
http://nd2x.net/wb8wju/5w.jpg


So, I think the hose clamp has enough design examples to show that it works.

jeff, wa1hco

gdaught6@stanford.edu wrote:

Hi,



The one time I did it...used a stainless hose clamp around the base of
the copper fins and pinched a wire under it.




This is probably a BAD way to do it, because the anode cooler will expand considerably going up to 250 degrees C! The hose clamp could result in some pretty big stresses in the tube. Rich Measures' (AG6K) website has a neat way to contact anode coolers that don't have caps for the purpose... or even those that do!

73,

George T. Daughters, K6GT



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