[Amps] plate bypass caps

[Jim W7RY]

Yup! Here are some. They are 5000 PF but just put two of them in parallel 
for .01 at 4KV. Steve said 2700 volts. So these should work fine? Ebay Item 
number 260288197318

73
Jim W7RY

----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "Steve Flood" <kk7uv at bresnan.net>; <amps at contesting.com>; 
<rfamplifiers at yahoogroups.com>
Sent: Sunday, January 11, 2009 6:50 PM
Subject: Re: [Amps] plate bypass caps


> 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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