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In Reply to: RE: I don't direct couple because I use filament bias. posted by drlowmu on August 09, 2014 at 09:35:29
Hi Jeff,
Just for reference, it was Mr Atwood who stated that the UBT1 was very marginal at ~510V and then only on condition that the secondary wasn't grounded and that the core was floated up to the voltage that the output stage was referenced to. He's the One Electron guy, so I take his word.
I'm sure there was probably some margin to his comment, and I guess it comes down to what you're comfortable with. In the end.. I'm happy with compromise.
Follow Ups:
I usually don't ground my secondaries.
Jeff
I like the idea of a fault current path in the event of a 3 stage DC meltdown !
MCB's here will shut it down in <0.3s, without the 0V reference the coil melts down in concert with the OPT.
Just not worth it.
Shane
There are poor PP amps and poor SET amps.
There are top of the heap PP amps and top of the heap
SET amps.
My experience says the very best SET amps, used with a speaker that does not tax them heavily, are cleaner, clearer, more dynamic, and sound more like music than the very best PP. And that's not because they are "thick, tubey, colored, etc." I hear less of those colorations, just utter clarity, with the best SETs.
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