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Single Ended Triodes (SETs), the ultimate tube lovers dream.

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RE: Properly designed SE amps

Just how much of what is filtered out was music?

None, although if poorly executed you might wind up with a poor distortion signature (what most people call the amp's 'sonic signature').

Operating fully differential (and therefore balanced) there is nothing specifically acting as a filter unless you include the fact that all audio circuits are filters in that they have limited bandwidth.

Distortion cancellation won't remove actual musical information, just distortion. Its never perfect of course. But what that means isn't that some music got thrown out; it means that some distortion got left in the signal.

In the case were a transformer is used to convert from single-ended to balanced (which is one of the things they do really well), if you are using a single-ended circuit to drive it you'll still get some of that pesky 5th. So you'll want to drive it with a balanced circuit rather than single-ended.

The way I get around drift in the triode driver is done by using a triode differential cascode with a highly effective constant current source. With the extra gain possible and with the current in the circuit highly regulated, the drift is really minimal and tends to drift to a design center rather than away. That solves a number of problems at once- the only issue then is driving the power tubes. I use direct coupled cathode followers for that. Over a period of weeks and months the drift is surprisingly minimal- no adjustments needed in that time unless a tube failed.

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