Add variable negative bias Vintage Fender Princeton Reverb AA1164 Tube guitar amplifier 5 easy steps

This is a popular modification for the Fender Princeton amps. Back in the day, Fender did not have variable negative bias on this model amp. It was a fixed negative voltage level, which did not allow for bias adjustment or a way to monitor tube current. This video will show you in 5 easy steps the update plus a convenient way to directly monitor the 6V6 current. After installation, bias setting is a piece of cake! Note: with the high price of tubes, you certainly want to ensure you have your tubes running at a safe level. E-mail if you need a copy of the hook up diagram. Remember guys, this is my full time job now. Please help me to move forward by spreading the good word and subscribe! I'm not getting any younger