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Hi... Having just tried going directly from my pedalboard to one side of the power amp, I discovered that it works without a preamp. I got to thinking about it and the 50/50 does have preamp tubes that I assume would accept Hi-Z and line-level signals. So my question would be... after the Hi-Z...

Has anyone experienced a power imbalance where one side does not keep up with the other? I've tried switching out the tubes (with others) and those seem fine. I think the amp may have been this way for quite a while. Any thoughts out there as to what the issue might be?