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RE: Is this feasible? Rectifying 6.3v for heaters

Phil - This is excellent work you have done here. I am impressed. I think I understand that using a FWB for Vin and a half wave rectifier for the Vcontrol has that pin higher in voltage by one diode drop.
I don't get "three 12AX7s in series". Is that three dual heaters? And wouldn't that add up to 36v? Please send the next diagram, I am learning so much here. This is audio archeology, the original designers are pretty much dead now, so we have to carry it on.

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