Re: [Amps] switching power supply for tube amplifier

["Roger" <sub1@rogerhalstead.com>]

> 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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