>
>
>-----Original Message-----
>From: W9GT <w9gt@home.com>
>To: Lamb <k7fm@teleport.com>; amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
>Date: 18 December 2001 01:33
>Subject: Re: [AMPS] Bypassing Screen of 4cx800a for 50 MHz
>
>
>>
>>Good suggestion Colin. I was familiar with the 4CX1500B (W5TMN) amp in
>>Bill Orr's Handbook, but never tried the grounded screen arrangement. I
>>built a 4CX1500B amplifier, but I used a conventional circuit and the
>>regular SK-800 series socket which had the built-in bypass cap. Really,
>the
>>grounded screen may be an excellent way to go and accomplish the desired
>>results. It is only complicated by the requirement for floating the screen
>>and bias supplies below ground.......
>This is an honest question, not a carping comment. Is bypassing the cathode
>to ground at -350V easier or less critical than bypassing the screen at
>+350V?
>
A poorly bypassed screen causes instability. A poorly bypassed cathode
causes less power output. The best bypass uses multiple caps of
different values in parallel.
cheers, Steve
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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