[Amps] GS35B Plate connection suggestions wanted

[jan]

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 at 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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>
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