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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.
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.
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