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Old 5th June 2009, 04:37 PM   #91
gl is offline gl  United States
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Join Date: Dec 2003
Location: Sierra Foothills - California
For a class AB amplifier you are correct. But the A40 is a class A amplifier. So the object is to set the bias high enough to allow the amplifier to remain in class A for as wide a range of load conditions as possible and low enough to prevent it from thermally self destructing.

Regarding the efficiency? That's a personal decision. My choice would be to run class A and turn the fire down one bar.

I have built two A40's although it was long ago. Both came up without a hitch and ran hot and trouble free for years.

Cheers,
Graeme
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