Tube Amp Archive

Hi there, First thing to check is are you sure its a ground loop? If you have a access to a DC supply, disconnect the heater wires to V1 A & B and feed it off 6.3VDC - should pull about 300mA. If your hum is gone its not a ground loop its the heater getting into V1A so then you have a few options. I...

Some gut shots as requested - sorry about the delay. As you can see it's a bit messy but the photos are only to show one way of doing this if you are thinking of making a SFTR your starting point. You can see that I have cut the main PCB in two pieces to separate the phase splitter and preamp sectio...

Hi there - been a long time visitor of the site but this is my first post - would highly recommend using a sf twin reverb as a donor - it means that you can build in the dumbleator and reverb! I used a super six chassis (essentially a twin reverb) and bought the boards from one of the chaps on the f...