Hey all, long time mostly-lurker here. I got a great deal on a PF-50T, totally dig it, except… It shipped with a really microphonic 12AU7 and the power tubes make this weird fizzy sputtering noise when certain notes are played (like 14th fret E on the D string). I took it into the local authorized Ampeg guy but he’s been really shady through the whole deal and seems like he’s trying to make a buck off me by insanely over pricing some Groove Tubes instead of just following through with the factory warranty’s replacements. This had been going on since April and I finally got sick of it and just ordered a bunch of matched Tung-Sol tubes with the 6L6GC STR for power. So now the amp sounds awesome and the sputtering went away, but the red biasing light doesn’t ever turn off. Once you warm the amp up and turn everything on with no instrument plugged in both the green and red lights are constantly on. When I switch back to the Ruby ones it can bias as written in the manual, but sounds like garbage. Did I get mismatched tubes? Is there some rating difference between these Tung-Sols and the factory tubes that would cause this to happen? The matched set are guaranteed so should I ask for replacements? Hoping @JimmyM or @beans-on-toast or someone with some experience could give me some advice. Ampeg support has not been very easy to deal with as you have to use their stupid ticketing system and responding to their emails seems to go nowhere. Thanks in advance!