• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

preamp tubes change


2004-10-22 6:07 pm
I´ve been reading arround and many peoples say that the change can be done, in a expert page it´s said that the change can be done but that it doesn´t allays work.

* means appropriate for parallel filament circuits
# means may not work in all circuits
Preamp and driver tube substitutions:

12AX7 (high gain dual triodes with pinout 9A)
12AD7* 12DT7 7729
12AU7# 5751* B339
12AU7A# 5751WA* B759
12AX7 6057 CV4004
12AX7A 6681 E83CC
12AX7WA 6L13 ECC803
12BZ7* 7025 ECC83
12DF7 7025A M8137
12DM7* 7494