Almost

Almost

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.

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Follow Ups Full Thread

Topic - 6CG7 instead of 12AU7? - ChasLieb 14:55:34 10/06/15 (13)

Much better sound and the pin-outs are different, some resoldering required. - Timbo in Oz 15:56:32 10/16/15 (4)

Cheap?? That's not true at all. - Ralph 12:45:08 10/19/15 (3)

Re:Other than the heater voltage, is the 6cg7 a substitute for the 12au7? - woffeldjur 10:08:28 11/12/15 (2)

Almost - Ralph 11:11:58 11/12/15 (1)

RE: Almost - woffeldjur 08:42:08 11/13/15 (0)

RE: 6CG7 instead of 12AU7? - Ralph 10:18:39 10/07/15 (7)

in most usage where the dissipation is low 6CG7s should sound just like a 6SN7 - Timbo in Oz 15:53:06 10/16/15 (6)

RE: in most usage where the dissipation is low 6CG7s should sound just like a 6SN7 - Blackdog 16:03:09 10/17/15 (5)

Sorry no, its designed in distortion numbers are quite poor - Timbo in Oz 20:19:16 10/17/15 (4)

Never seen a 12AU7 in an RF circuit - Ralph 09:22:03 10/19/15 (0)

RE: Sorry no, its designed in distortion numbers are quite poor - Blackdog 20:41:11 10/17/15 (2)

RE: Sorry no, its designed in distortion numbers are quite poor - Lew 08:41:33 10/19/15 (0)

I don't buy new, I now just upgrade / rethink vintage stuff. - Timbo in Oz 20:51:31 10/17/15 (0)

Follow Ups

Almost - Ralph 11:11:58 11/12/15 (1)

RE: Almost - woffeldjur 08:42:08 11/13/15 (0)

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