Hi guys, i have made a diy guitar amplifier 6 month ago. It was going well with my active pickup guitar but has some squeel with passive pickup. I decide to replace half of the wire with shielded wire. Doing so, i did place thing differently like moving the filter caps. Anyway, i did an error that i think is very bad. I forgot to plug the center tap of the primary of the output transformer and tried the amp. Absolutely no sound has come out, i have induced guitar signal and turn the volume to more than the 1/4. I've found my error but the amp is now having an insane hum and almost no signal. I mean, i can hear guitar but it is very low compared to the hum. I have double check every connection, nothing seem broken visually. It act differently when i turn the volume (preamp section) if it is on solid state or tube rectifier. Also, it is very affected by that preamp volume and is very loud even at all volume to 0. I have resistance in the primary of the output transformer. I wonder if it could be the power tube? The amp is a badcat clone base on ceriatone model "stray cat"
here is a layout(sorry i don't have the electrical schematic)
http://www.ceriatone.com/images/layoutPic/matchlessLayout/StrayCat30Ceriatone.jpg
What do you think?