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Old 19th January 2010, 08:23 PM   #1
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Default Sweep tube suggestions

Greetings everyone,
I could use some suggestions on designing an amplifier with sweep tubes. I am looking for power in the 85-115 watt range. I have 750v @ 350ma and a regulated 250v @ 150ma available. I'm thinking of class AB1, or AB2 maybe even class B operation. This amplifier will be a modulator for an AM transmitter.

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Old 19th January 2010, 08:39 PM   #2
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Class B screen drive with pp parallel 17W sweeps will get you there. Go take a look at some of the schematics at davidberning.com.
“Instead of Rational Law, objective truths perceptible to any who will undergo the necessary intellectual discipline, Knowledge will degenerate into a riot of subjective visions. . ." - Auden
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Old 20th January 2010, 12:31 AM   #3
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You could just build one of these:

Posted new P-P power amp design

I get 125 watts per channel out of mine in stereo. Paralleling the two channels could generate twice the power with the appropriate load. You could build one channel using point to point construction. You don't need the power supply parts, just use what you have. Do you have a modulation transformer yet, and what are you using for the RF final amp?
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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