12AX7 Tube Diagram Note that the information presented in this article is for reference purposes only. Amplified Parts makes no claims, promises, or guarantees about the accuracy, completeness, or adequacy of the contents of this article, and expressly disclaims liability for errors or omissions on the part of the author.. If you wire three 12AX7 at 12V each for 36V, you need 38V, only 5.5% loss, 1/6th the heat and lower cost. Also series-wiring is easier to sneak through the PCB puzzle.
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Learn about the heater wiring for the 12ax7 tube and how to properly wire it for optimal performance in your audio equipment.. I've been researching for a new (only my 2nd) project that uses 12AX7 tubes and I am confused by the heater wiring possibilities. It seems, based on the posts I've read, that given one secondary filament supply of 6.3VAC (ie, from a Hammond 269AX) that if I connect the + side to pin 4 and the -.
