[Amps] Plate bypass caps.

[Carl]

Doubling the plate blocking cap with another 1000pf, and adding a .01uF @ 
3KV disc cap to the base of the plate choke will improve efficiency on 160. 
The tank coil could also use an extra turn as well as some more fixed Load 
C.

Making a new top cover from aluminum works wonders on all bands.

Another step is changing the filament choke to a 7 1/2" Type 33 mix ferrite 
rod wound full of #14 enamel wire.

 Adding a tuned input network also is a big help on all bands with SS xcvrs.

Carl
KM1H


----- Original Message ----- 
From: "Mike & Becca Krzystyniak" <k9mk at flash.net>
To: <AMPS at contesting.com>
Sent: Sunday, July 05, 2009 11:42 AM
Subject: [Amps] Plate bypass caps.


>
>   Question on plate bypass chokes and associated caps:  I have Dentron amp
> with 160m on it, but the bypass cap at base is 1000pf.  Then there is a
> smaller maybe 10 turn choke of #12 enamel wire going to a second 1000pf 
> cap.
> I picked up a PIE plate choke and wonder if I should change out the 1000pf
> door knobs for a larger value (one or both). What is the concensus on the
> proper way to make this mod?
>
> Thanks...  Mike K9MK
>
>
>
>
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