Check out the "how to set bias" video on the Repairs page.

Other Services and Products

Allen Amps offers fast, reliable repairs and quality replacement parts for '60s and '70s Fender™ guitar tube amplifiers at reasonable prices.


Allen Amplification offers quality repairs of vintage 60s and 70s Fender™ tube amps with a typical turn-around time of 2 weeks or less. All work performed by David Allen, EE and guaranteed. My shop rate is $50/hr and I have a $100 minimum billing for chassis shipped in for repair.