[Amps] plate bypass caps

[Russ Williams]

But will they handle the RF current?


--- On Sun, 1/11/09, Jim W7RY <w7ry at arrl.net> wrote:

> From: Jim W7RY <w7ry at arrl.net>
> Subject: Re: [Amps] plate bypass caps
> To: "Steve Flood" <kk7uv at bresnan.net>, amps at contesting.com
> Date: Sunday, January 11, 2009, 8:44 PM
> 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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