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RE: Thanks for the heads-up

"A fully balanced circlotron amplifier can operate in Class A for at least the first several Watts of output power, at least as much Class A power as they get from their SE OTL."

Well, to be fair, their SE OTL is, they say, 20W output. By contrast, a typical 20W circlotron or totem pole (it makes no difference, for this discussion) would be biased at, say, 200mA, and so the maximum power it could achieve into 8 ohms, while remaining in class A, would only be about 640 mW, if I have my sums right. A circlotron or totem-pole OTL really is operating in class AB for all except a rather miniscule fraction of its maximum achievable output power.

I can see other reasons, though, for not being so keen on their SE OTL. First of all, it must be hugely inefficient, and it weighs a ton (well, a ninth of a ton, anyway!). And also, it presumably has a hefty choke loading the SE output stage. So although it has no output transformer, it is certainly not free of iron-cored inductors in its output stage.

Chris


Edits: 02/12/15
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