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RE: Touche', sort of...

I was taking the specific example of a typical circlotron or totem-pole OTL with 200mA quisecent bias, as one might have in a 20 or 30 W amplifier (probably like the Atmasphere S-30). Then, I think, it remains in class A only up to the 640 mW or so that I mentioned.

One thing that is not taken into account is the impact of the load impedance. As with any amplifier, the lower the load impedance, the less class A operation can be had. In the case of the M-60 (with 1 amp of idle current) it remains (barely) in class A2 operation up to full output into an eight ohm non-inductive load (insofar as a 'scope on the cathode resistors is able to show anyway; cutoff does not occur until the amp is into clipping). But change the load to 4 ohms and the amp is class AB2.

The S-30 does considerably more than just 640mW of class A power (its idle current is around 400mA). But it is best running into 16 ohms rather than 8, and this should probably be taken into account.

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  Michael Percy Audio  

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