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OTL, Output Transformerless Amplifier User Group.

Did you want MY voltage measurements?

Mine might not be relevant, because my amplifiers use the MA2 power supply, essentially, which mainly means that my input and driver stages run on ~+/-400VDC. Plus I have heavily modified my driver stage. But I don't think you meant that anyway. You've gotta measure your own amps to find out what's up, I am sure you know.

BTW, if you still own the Sound Lab, the marriage to Atma-sphere can be rescued. It's too detailed to describe here, but send me a private email and we can discuss. There are actually two solutions, one available from SL and the better one (IMO) available from another source (maybe). The latter allows you to eliminate the high pass filter in the SL crossover, i.e., to go no crossover. The crossover is the culprit that lowers the input Z across the midrange and sucks up amplifier power and generally makes life difficult for tube amplifiers.


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