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Old 15th April 2012, 08:25 AM   #1
MCLL is offline MCLL  Hong Kong
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Default About 6AS7BTL Amp

Hello everybody,

I have TWO questions for attached 6AS7BTL schematic.

How much this amp output?

What is the best speaker for this amp such as 4ohm, 8ohm, 16ohm or 32ohm?

Cheers

MCLL
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Old 15th April 2012, 10:49 AM   #2
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Quote:
Originally Posted by MCLL View Post
I have TWO questions for attached 6AS7BTL schematic.
What is the best speaker for this amp such as 4ohm, 8ohm, 16ohm or 32ohm?
As much as possible - as for all OTL designs.

Quote:
How much this amp output?
Depends mainly on the load impedance - as for all OTL designs.

Best regards!
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Old 15th April 2012, 06:22 PM   #3
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Wow, that amp actually looks really simple! What topology is it? Potentially, would you need a specific load for it or a most efficient value?
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Old 15th April 2012, 08:52 PM   #4
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Originally Posted by Test Electrix View Post
Wow, that amp actually looks really simple! What topology is it?
"H" Bridge: you usually see something like this implemented with MOSFETs, and operated as a Class D amp. Not so much as an audio stage, as it has the same problem as any stacked design: one half operates as a cathode follower, and the other as a grounded cathode stage, with unequal voltage gains, and inherent imbalance. (No "P-Channel" VTs available.)

Quote:
Potentially, would you need a specific load for it or a most efficient value?
You'll get the best performance by running it with the load it was designed to accommodate.
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Old 15th April 2012, 09:44 PM   #5
kevinkr is offline kevinkr  United States
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I really wouldn't go below 32 ohms with this design... (And that is likely to be marginal)

You could parallel additional 6AS7G, but would have to match them carefully and getting them to current share might be tricky. Another alternative would be the 6336/A/B/C. Depending on available drive a quartet of 6C33 might get you some real power.

Edit: On second look the implementation of the feedback loop is questionable.
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