• 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.

tube amp doctor tad black plate kt88

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Guitar amps are all about carefully crafted distortion, audio amps are all about accurate reproduction, so advice from a guitar amp perspective is unreliable for an audio amp.

The actual answer is to measure the curves or distortion for the various alternative valves and pick the best behaved oncs - not very practical for most of us, but someone may have done this. Note that noise performance may be more important for an audio amp than a guitar amp.

Or in short anecdotal evidence from a different application isn't worth as much as measurements from the actuall area of application.
 
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