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  1. M

    PRS MT 15: FX Loop Hum Solutions

    I can tell a big difference with just a delay before the loop vs in the loop on the dirty channel. It’s almost unusable in front as it seems to create this washy echo effect. Before the clean channel everything is good.
  2. M

    PRS MT 15: FX Loop Hum Solutions

    Sorry to hear that man. Hope things start looking up for you!
  3. M

    PRS MT 15: FX Loop Hum Solutions

    Any particular reason you sold it? Just curious.
  4. M

    PRS MT 15: FX Loop Hum Solutions

    I guess it depends on what you are trying to do. If you want to tame the gain a little it sounds like the 5751 in v3 is worth a shot. I wouldn’t put a 12au7 in v3 though As that might take too much of the gain away or cause some issues. If you want to get rid of some noise in the effects loop...
  5. M

    PRS MT 15: FX Loop Hum Solutions

    Official response from PRS: The effects loop tube is the last tube in the front preamp tube row, on the opposite end of the input. So it appears previous people were mistaken here about which tube was the effects loop tube, everyone has been changing the phase inverter apparently lol
  6. M

    PRS MT 15: FX Loop Hum Solutions

    Well no word back from PRS on the tube placement yet so I tested the 12au7 in the front left 12ax7 spot, seemed to have the exact same effect as swapping the tube near the power tubes. I am talking to myself now on a year old thread so I will just leave it at this for anyone that ends up here In...
  7. M

    PRS MT 15: FX Loop Hum Solutions

    Prs initial response, I am trying to get clarification on the effects loop tube placement still:
  8. M

    PRS MT 15: FX Loop Hum Solutions

    I am also confused by the official prs diagram. Is the effects loop tube the stand alone tube close to the power tubes or is it the last tube to the left when looking straight at the amp? Have we all been changing the phase inverter tube and not the effects loop tube? I emailed prs to ask.
  9. M

    PRS MT 15: FX Loop Hum Solutions

    I know this is an old thread but I wanted to share my experience for others that may come here looking for advice. I followed the advice here and bought the jj12au7 and did the swap. The good - the noise from the effects loop was almost non existent The bad - Immediately I noticed a...


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