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RE: More Questions

Cathode biased, without driving the grids positive, 47 volts peak drive will give 7.5 watts of which only 6.2 will be Class A. That would be Class A/B1 operation.

I always assume the tubes will be driven to the max without driving the grids positive. If there is something wrong with making this assumption, I'm sorry. If the grid is driven positive we would have A2 or in this case A/B2.

Let me answer your question again in a different way.

If you had a 15 watt Class A/B amplifier that gives 3 watts Class A but you never turn up the volume higher than 2 watts the amplifier would be operating in Class A all the time. But if that was the case why wouldn't you redesign the amplifier to give 7 watts, all Class A?

The distortion at the 2 watt level would be lower and since you don't need power beyond 2 watts, the 8 watts of total available power you gave up are of no consequence.

Designing for max Class A output will give lower distortion at all levels up to that max.

Tre'


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