Well, here's new thing out of nowhere. I usually use input two on my old V4B simply because it has a bit less hum. Starting just yesterday, there's almost no volume on that input. If I crank the volume knob all the way up on the amp, a bit of bass comes through. There's no crackling or spitting as I turn the knob, so I don't think it's a dirty pot. Relatively new tubes that were biased by my tech (I'm waiting for it to cool down before I pull the 12ax7 in the pre). Assuming the tubes are OK, any of you have any ideas? Volume pot just wore out? That doesnt seem likely.