In Reply to: Custom 6sn7 preamp runs too hot posted by Cuernavaca on May 12, 2017 at 10:36:09:
The power supply voltages do not make sense - total supply is 34mA, of which 23mA goes to each line amp, and the cathode followers draw 16mA - a total of 62mA.
The really big issue is the first Zeners, which are supplied through the 470//680 ohm resistors. With only 20v drop, they are extremely sensitive to the power line voltage.
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- RE: Custom 6sn7 preamp runs too hot - Paul Joppa 16:53:52 05/12/17 (0)