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Re: [Amps] Parasitics & Filament Sag

To: John Vickers <wa4tt@nlamerica.com>
Subject: Re: [Amps] Parasitics & Filament Sag
From: R L Measures <r@somis.org>
Date: Mon, 28 Aug 2006 20:10:02 -0700
List-post: <mailto:amps@contesting.com>
On Aug 27, 2006, at 11:49 AM, John Vickers wrote:

>
> ----- Original Message -----
> From: "Mike Sawyer" <w3slk@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). So it sounds to me that there is some  
>> merit to
>> what
>> Rich is saying.
>
> 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.

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

> Just a
> wide copper strap from the plate choke (homebrew) to the tubes.  
> Never had a
> problem with parasitics. Used on 80, 40, and 20 m. Would run it  
> with 1, 2,
> or 3 tubes by just unplugging them and left the strap hanging. They  
> were all
> mounted in a straight line so plate lead was excessively  
> long.Certainly
> wasn't due to my engineering prowess--- was only 15 yrs old at the  
> time. In
> 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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>

R L MEASURES, AG6K. 805-386-3734
r@somis.org



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