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In Reply to: RE: 6CG7 instead of 12AU7? posted by ChasLieb on October 06, 2015 at 14:55:34
Use of 12AU7s in audio is not a good idea. Cheap for MFRs is the cause.
? See my earlier post further down this thread.
Skeptical Measurer & Audio Scrounger
Edits: 10/16/15Follow Ups:
They cost the same as most any other tube- 12AX7, 6DJ8, etc.
Your other comments down the thread don't seem to hold much water either.
"Other than the heater voltage, is the 6cg7 a substitute for the 12au7?"
And, if you are a bit unsure about the heater voltage, there is always the 8CG7..
The pins on the bottom are different.
All the connections are the same except the filaments- the 6CG7 needs 6.3V between pins 4 and 5, while the 12AU7 needs 12V or you can also run the 12AU7 on 6.3V by tying pins 4 and 5 together and then applying 6.3V between them and pin 9.
The 6CG7 of course can handle more current having twice the plate and cathode area. But otherwise it and the 12AU7 are similar geometry.
Yes, indeed - but are easy to correct.
If your amp is hardwired, just shift the wires.
Or, are the sockets soldered to a printed board, you can cut the print, or the socket on top.
Very easy to work with, no multilayer printed boards, and you dont have to worry about ESD :)
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