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OTL, Output Transformerless Amplifier User Group.

RE: You've got it wrong

The 4-pole capacitor should be thought of in this context as no different from any other standard (2-pole) capacitor. It will NOT handle both phases in one can, in other words. And really, the term "phase" is a little misleading. Think of them as separate power supplies, period.

No, the circlotron would work, I guess, with no capacitors, but you would be listening to a lot of hum and noise. (I won't go into the fact that the balanced output stage does cancel a lot of common mode noise.) The filter capacitors aid the rectifiers in converting AC from the wall socket into DC to run the output tubes. What comes off the rectifiers still has a lot of noise in it. The impedance of the speaker being very high (you mention 500 ohms) would only mean that for extended low bass response you would need less total capacitance than for a typical 8-ohm speaker. The "other" role of the capacitance in this OTL amplifier has to do with facilitating energy transfer from output stage to speakers. In a conventional transformer-coupled tube amp, THAT function is handled by the output transformers.


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  • RE: You've got it wrong - Lew 16:26:09 03/29/14 (0)

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