Tube Amp Archive

Swapped the two wires on the resistors on pin5, reconnected the NFB wire and the squeal is gone. Thank you for your solution. This was a first build by my 14 year old son. Even though I find the hiss produced at an acceptable level, we would like to reduce. The first tones from the amp are great, su...

I had the same squeal that was explained in the begining of this thread. When I disconnected the NFB wire the squeal went away. The prescribed fix for this as stated earlier was to swap OT primary wires. Does this mean that I swap the current wires. I am really asking do I desolder the OT primary th...