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with schematic for 01a driving 45. At least I think I saw it here a few weeks ago, now I can't seem to find it. Any help would be appreciated.
Here you are. Bear in mind this has more gain than the 45, since 4P1L has a mu of around 11. So 2 stages could be enough for high efficiency speakers. The other advantage of the 4P1L is that it can easily be driven in filament bias as shown so no cathode bypass cap. And of course it's a lot cheaper.
Very kind of you. I am certain that I saw such a circuit however, perhaps not posted at this forum. It as far as I can recall used filament bias so perhaps that's what made me think it was you. Thanks!
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