• 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.

Designing a simple tube opamp?

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I've been interested in the idea of makinig a tube opamp suitable for stompbox use that uses 12U7 tubes for quite a while. Mostly because these tubes are happy running off a 12v wall-wart!

I've been checking out the ol' Philbrick tube opamps, but after seeing Joe Davisson's discrete transistor opamps (here & here), I'm keen to see if a much simpler alternative to the Philbrick version is possible.

Would it be possible to simply mirror Joe Davisson's Compression Opamp design by using one 12U7 as a differential pair going into another 12U7 acting as Class A stage? Would it then be possible to use the left-over half of the second 12U7 as the compression diode by omitting the grid?

Sorry if these are stupid questions! :boggled:
 
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