A Diagnostic Tool for Measuring the Bias on Vacuum Tube Amplifiers. Works on most octal socket tube amps. Small enough to carry in most guitar cases. Requires no power source other than amp it s plugged into. No expensive batteries to replace. Can be used to match tubes into pairs. Website Design by Digital Wave, Inc.

Anyways, the amp is built and sounds great. I did end up adding in a global negative feedback to keep it a little cleaner. On top of that the Hammond output transformer has a confusing secondary wiring that is comically difficult to wire to a switch. It is also important t.

At Divided by 13 Amplification, we build high quality guitar amplifiers, by hand, one at a time, and with an attention to tone, utility and craftsmanship not found anywhere else. Paul McCartney band member, solo artist, studio musician, Ednaswap, and on, and on, and on.