[Amps] Parasitics & Filament Sag

John Vickers wa4tt at nlamerica.com
Tue Aug 29 00:18:54 EDT 2006


----- Original Message ----- 
From: "R L Measures" <r at somis.org>


>
> On Aug 27, 2006, at 11:49 AM, John Vickers wrote:
>
>>
>> ----- Original Message -----
>> From: "Mike Sawyer" <w3slk at uplink.net>
>>
>>>    I used nichrome and they worked. It was the only substitution  made. 
>>> The
>>> original suppressors were only in the amp for a short time (two  weeks 
>>> in
>>> intermittant operation).


>>
>> I believe you said this was a pair of 813's. I still have one I  built in
>> 1965 running 3 813's and its never had an anode suppressor in it.

Rich wrote:

> 813s don't need a VHF suppressor because they are pushing the limit  at 
> 28MHz.

That was my point Rich. Mikey stated he needed a nichrome suppressor to tame 
it. Seems to me the problem was elsewhere and the suppressor just patched 
it.

>> my case--- I didn't need *any* suppressor. In your case you did. It 
>> would be
>> beneficial if you had figured out WHY.
>> 73, John WA4TT



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