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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: 12AU7 to 6GC7 in MC240 posted by Paul Kehayas on January 16, 2019 at 19:33:43:
We've modified a pair of MC30s and a pair of MC40s to use the 6CG7 instead of the 12AU7 to great success.
If you like it (and you will) ditch the adapter. You just need to rewire the socket slightly. The plate, grid, and cathode pins are the same in the two tubes. The 12AU7 has a center-tapped heater: Pins 4 and 5 are the "outside" pins and pin 9 is the center tap. You just need to move the wire on pin 9 to pin 4 (or 5) and break the connection to the other pin.
The 6CG7 draws more heater current than the 12AU7, but the power transformer can supply it.
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Follow Ups
- RE: 12AU7 to 6GC7 in MC240 - Lee of Omaha 17:06:16 01/17/19 (0)
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