• 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.

Microphone preamp with compressor

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Yes, here's a safety thing I should point out:

With rewiring of the heater circuit, you *can* use a 12AX7 for the 6N2P, but DO NOT even attempt to replace a 6N1P with a 6DJ8/ECC88. The converse can be done without any safety risks though.
 
Geek said:
DO NOT even attempt to replace a 6N1P with a 6DJ8/ECC88. The converse can be done without any safety risks though.


can you say why? i cant get any 6N1P's here, but i have plenty of ECC81 - 88's around.. im really keen to build this even with the higher noise figures..

also, is there a simple way to make the input line level for line level processing?
 
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