[Amps] plate bypass caps

[Carl]

Im using CD .01 6KV that I got off an Ebay surplus components seller. 
Mylar type and USA made, about $1 each in 20 quantity.

It has been my experience that 160M performance improves with the .01 
which I parallel with the existing .001

Carl
KM1H

----- Original Message ----- 
From: "Steve Flood" <kk7uv at bresnan.net>
To: <amps at contesting.com>; <rfamplifiers at yahoogroups.com>
Sent: Sunday, January 11, 2009 8:38 PM
Subject: [Amps] plate bypass caps


>I have an Ameritron plate choke mounted in my amp project.  It is 
>225uH.  With 2700 plate volts, this is 2544 ohms at 1.8 MHz and thus 
>1.06 amps.  I am now assuming the plate bypass capacitor at the base of 
>the choke must be very low reactance on 1.8 Mhz which tells me .01 or 
>.02 uF at maybe 5kv rating.  Am I thinking about this correctly?  If 
>so, such capacitors seem quite rare - the usual internet sources only 
>carry .001 or .002 which would seem ineffective at bypassing at 1.8 
>MHz.  Yet, there are many 160m amp designs that use .001 for bypass. 
>Perhaps they are using much much larger plate chokes?
>
> Steve, KK7UV
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