5u4

I posted this deep in my NAD thread, where it got a little drowned out. I thought that maybe I'd get more advice if I promoted it to its own thread: My new Super Reverb seems to be an AB763, however, it came with a 5U4 tube, not a GZ34 like it should if it were stock. I took some voltages in...

Fender has said I could use a 5U4 in my Fender Custom 64 Deluxe Handwired to reduce the plate voltage on my NOS 6V6GT power tubes. They said it would not affect my warranty but cautioned that I would have increased SAG and less power output. I currently do not have a 5U4 to experiment with...