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SVT-4 Pro - Power Amp A much quieter than B

Discussion in 'Amps and Cabs [BG]' started by KeithGibbons, Jan 5, 2020.

  1. Just wondering if anybody has had the same issue with their SVT-4. Was playing through Power Amp A only for some time into a single cabinet. One day I turned the amp on and it was really quiet. Switched over to Power Amp B and it’s fine.

    I’ve checked the stereo/mono modes, tried running bi-amp mode etc. I even plugged into the Effects loop returns for both PAA & PAB and am getting roughly the same result. Less noticeable without the preamp section, but still getting a volume drop.

    I guess my question is: Would a dead preamp tube still be the issue even though I’m bypassing the preamp when plugging directly into the effects loop? Or should I just take it to a tech?

    Thank you in advance.

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