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
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|