Hello people, I have here a 5F2a clone (these chinese clones), which produces a volume about half of what it should be. By connecting different parts of the tone path between this amp and another 5F2a I have located the issue somewhere between the grid of V1b, and the grid of the 6V6. I think these components are of influence, am i correct? -1,4k V1b cathode resistor -22Nf coupling cap -100k plate V1b plate load resistor -220k 6v6 grid leak resistor All resistors measure fine, cap is also ok (even replaced it). I have also replaced the 12ax7 tube to no avail. One strange issue seems that the plate of V1b has a higher voltage (215v) than the plate of V1a (around 150v). (I must note that in these amps, suck a low a plate voltage of 150 is normal, due to a strange chinese rectifier tube.). Out of the power section I get 232v, both go to a two 100k (measure closer to 85) resistors, respectively to the plate of V1a and V1b, but for some reason I get a much higher voltage at the latter. I am not an amp tech, but using deduction and measurement I got this far. However, I'm out of options right now. What should I be looking for next? Should I recheck some components? Check wires? THanks in advance for your kind help.