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Finally a way to tell your worn label 12ax7s from the 12au7s

Tonite I was upgrading one of my fisher 500c receivers and I discoverd that only a 12ax7 will work in the driver stage..If you put in a 12au7 or 12at7,it will come on for 3 seconds and die down.
Anyway,if your like me you no doubt have several 12ax7s and 12au7s with worn labels where you cant tell which is which..The only tube that works in the driver phase splitter is the 12ax7..I tried a 12ay7 and 12at7 and 12au7 just for the identity test.
Try it if you have a 500c or 800c..Anyway it took all the guess work out of the tube identification.


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Topic - Finally a way to tell your worn label 12ax7s from the 12au7s - Michael Samra 22:18:19 04/01/07 (1)


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