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Old 7th January 2012, 12:45 PM   #1
woody is offline woody
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Location: Tyrone Ga. U.S.A.
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  Canada
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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.

Modulus-686: 240W/8Ω @ <0.00025% THD. Modulus-86: 40W/8Ω @ 0.000054% THD. DG300B & Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 5th January 2015, 01:25 PM   #3
GERPUD is offline GERPUD  Canada
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What about this configuration on tube lab using LM4780 to boost the output of a small SE tube amp?
Would it work as shown or it is simply a theoretical design that makes a nice blog?
Power Boosters

Ideally, I'd like to bring a 9W SE combo amp to 30-50W using this kind of design.

What's important to consider?
Any advices?

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Old 6th January 2015, 03:49 AM   #4
stocktrader200 is online now stocktrader200  Canada
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Location: Calgary
that may work, I was thinking of using the 4 ohm tap and driving a single ( chip ) inverter amp set at a gain of -0.95 to maintain stability.
I was wondering if anyone gas bridged an actual tube amp ?
if so, what were the results?
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Old 6th January 2015, 02:04 PM   #5
GERPUD is offline GERPUD  Canada
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I had a response in Amp Garage forum.
This guy has done, it's working, and he give the schematic.
Very nice set up!
Take a look.
scopeblog Ninja Corvette Hybrid
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