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Ampeg V4B no volume on input two?

Discussion in 'Amps and Cabs [BG]' started by corinpills, Oct 29, 2017.

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  1. Oct 29, 2017 #1
    corinpills

    corinpills

    Nov 19, 2000
    Boston, MA
    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.
     
  2. Oct 29, 2017 #2
    beans-on-toast

    beans-on-toast

    Aug 7, 2008
    Good chance it is the pre-amp tube. V1 is channel 1; v2 is channel 2.

    One step at a time. Assuming the tube is alright, check the gray shielded wire that runs from the channel 2 pot to the board. Sometimes the wire breaks at one of the ends. It could be that the tube socket needs to be cleaned with deoxit. Many possibilities.
     
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  3. Oct 30, 2017 #3
    corinpills

    corinpills

    Nov 19, 2000
    Boston, MA
    Thanks for the suggestions. I'm going to check that out when I get home from work.
     
  4. Oct 30, 2017 #4
    BassmanPaul

    BassmanPaul Inactive

    Aug 25, 2007
    Scarborough Ontario Canada
    Put V2 into the V1 socket and V1 into the V2 socket. See if the problem follows the tube.