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In Reply to: RE: 12AT7 runs fine on either 6.3 or 12.6 V........ posted by Steve O on August 04, 2017 at 16:27:15
Still not to late. How do you do it? That makes it even more of a lesson!
Edits: 08/04/17Follow Ups:
You would connect one wire from your 6.3V source to the centertap of the 12AT7 filament, and the other wire to both ends of the filament tied together.
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Buy Chinese. Bury freedom.
By placing the two halves of the heater in parallel the heater runs on 6.3 volts.
Pins 4 and 5 get tied together for one connection and pin 9 is the other connection.
Tre'
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