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Old 7th January 2012, 12:45 PM   #1
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Default Power booster

I found this on the Tubecad web page. By grounding the output and
taking the output from the center of the split power supply we get 6db
of gain. Say I took a 2a3 amp and used a 8 ohm load resistor and this
booster I could get about 12 W . Or if our transformer would support it
wire it as a 16 ohm load and then conect the booster for about 16W.
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Old 7th January 2012, 05:28 PM   #2
tomchr is offline tomchr  United States
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That circuit may work in the simulator, but you'll be faced with some engineering challenges to make it sound good. If your goal is to get semiconductor sound, I suggest looking at something like the LME49811 or LM3886. Those are fine power amps and will provide plenty of power. You could drive them with a tube preamp...

If your goal is to get a tube amp with > 10 W of power, then a single ended 2A3 won't do the job. I'm getting 12 W out of a 300B when driving it hard (use with current production 300B's not your $1k WE originals!) Another way could be to set up two 2A3's, 300B's, or whatever tube you fancy as a push-pull amp. That would give you power.

Or if you want a SET amp to rock your house off its foundation, get more efficient speakers.

~Tom
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