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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: Please clarify: "change wires" posted by mnilan on June 18, 2014 at 11:36:44:
REWIRE Pin 9 to pin 5, and make sure pin 4 and 5 are no longer tied together on the sockets as the 6CG7 is a 6 volt tube and the 12AU7 can be either 6 or 12 volt filament. The 300 milliamps CAN add up but usually the power transformer is forgiving... for one or two. One can install a 12BH7 to see if said transformer will overheat, outside of the improvement in sound there may be no undue heat.
The 12AU7 was RUSH designed as a replacement for the octal 6SN7...It was SO bad, designers built the 9 pin 6CG7 in order to make a valve electrically identical to the superb octal 6SN7. The screen found in early 6CG7's between the plates was there {in the beginning} to EQUAL the quality of a 6SN7. If you are using true 6CG7's that have an internal screen between sections, then you'll need to connect pin 9 to ground.
The Mind has No Firewall~ U.S. Army War College.
Edits: 06/18/14
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