• 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.

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I should add that the feedback noise starts building in one speaker and shifts to the other before it gets really scary.

Could this somehow be related to the makeshift way I've set up the "biamp", that is, by running the highs out of the x-o to one amp input and the lows to another? I'm just guess, based on the idea that I'm doing the makeshift "pseudo-bi-amp mono" thing with an amp that normally is stereo.
 
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