[Amps] switching power supply for tube amplifier

[jeremy-ca]

6C21 = Pulse rated 450TH  I had a pair of NIB Matchletts but never got 
around to using them. Got lucky with a bunch of local 4-1000A BC pulls 
instead.

Carl
KM1H


----- Original Message ----- 
From: "Roger" <sub1 at rogerhalstead.com>
To: <amps at contesting.com>
Sent: Friday, September 14, 2007 8:10 PM
Subject: Re: [Amps] switching power supply for tube amplifier


>
>
>
>> Hamilton Horta - PY2NI wrote:
>>>     It has been done.... see http://w5jgv.com/amateur_radio.htm
>> Down the bottom of the page there's some interesting archive
>> stuff. Can anything as neat and tidy as the 813 amps really work? :-)
>
> Sho Nuff...I built a modified version way back then. It used a band
> switching B&W PI network. Worked like a champ. OTOH I didn't have the big
> meter rackin mine
>
> It looked a lot neater than my original 6C21 on 80 through 20. Not nearly 
> as
> impressive visually though <:-)) I picked up a bunch of those 6C21s for $5
> each as no one wanted them. Now they cost a small fortune.  I saw an amp
> using a pair of them on 6-meters. IIRC there was an article in QST on it 
> as
> well. Being RADAR pulse modulator tubes they had enough cathode emission 
> to
> blow the plate right out of one.  They were about 16" tall and a bear to
> neutralize. Looked similar to a 250TH on steroids.
>
> 73
>
> Roger (K8RI)
>
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