Hallo mates, I am building a micro champ/deluxe from the projects of Mr. Robinette. It was my purpose to NOT buy anything, so I just used parts I had liyng around and, of course, some part is out of spech. For example the output transformer is a 9K single ended ot that I got from an aborted project and the volume pot (right now I did not bother with master volume and tone control) is 2,2 M instead of 1M. Althought this differencies the amp doesn't sound too bad but the volume pot is behaving in a strange way: at minimum it makest a strong hum and noise (just like when you leave a jack unplugged and it picks up noises). When you raise the volume the sound it's ok, even a little bit of crunch near maximum, but when the pot is maxed I get no sound at all. I noticed something strange: I have 100K plate resistor and a 2,2K cathode resistor on the second stage of the preamp; I tried bypassing the cathode resistor with a cap (all the other cathodes are already bypassed), but the sound does not change. I also tried another cathode resistor (I got aroun 1K) and it made no difference too. I tried all the pot I had (a couple of 470 K and another 2,2M) and they all exibit the same problem reported, so I think it's not the pot. Have you got any idea about the possible cause?