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Re: SET/OTL

Posted by Ralph (M) on December 15, 2006 at 11:10:25

In Reply to: SET/OTL posted by Jim Dowdy on December 14, 2006 at 20:32:41:

The thing that makes the SETs work is the lack of hysteresis loss in the output transformer. Since the power tube is biasing the OPT at 1/2 full power, the polarity of the magnetic field in the OPT never changes- so there is no hysteresis loss.

In a push-pull amp the magnetic fields generated by the two output tubes cancels when the amp is quiescent. At any other time the magnetic field in the transformer is either positive or negative. Thus, anytime the signal crosses from negative to positive (or back), some energy is used from the signal to reverse the magnetic field. This non-linearity is a source of low level distortion and loss of low level detail.

Take away the OPT and you take with it the argument for SETs, as you have gotten rid of hysteresis loss. Now you can have push-pull and bandwidth, with at least the same low level detail that SETs can get.

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