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RE: Is this feasible? Rectifying 6.3v for heaters

With 6.3 VRMS and a full wave silicon bridge you will get ~ 7.7 Volts peak. If you don't care about regulation you can use a cap input filter and chose the cap such that with ripple the average DC voltage is 6.3 Volts.

Someone mentioned a choke input filter to keep peak currents low. With the 6.3 VRMS expect ~ 4.5 volts with the diode drop.


Forget the LM 317. It has ~ 3V minimum input to output differential. If you want regulation and still use the 6.3 V winding which you were planning you will need a low drop regulator.

I regulated the heaters in my Harmon Kardon Citation 4 and I wanted to stay in regulation down to 90 Volts from the mains. I used a state of the art low drop regulator from Linear Technology. In the Citation 4 the 12AX7s are configured for 12.6 volts and put in series so the required voltage is 25.2 volts. All this makes diode drops less significant. I'll have to check, but I think the part which I used will handle 600 ma.

Phil

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