Bias Board Maintenance

This upgrade replaces vital parts on the bias board. This improves stability and reliability of the entire amplifier. In Fender amps, this circuit regulates the negative bias voltage which dictates how the power tubes are operating.
In Fender amps with solid state rectifiers, this board not only regulates bias voltage but also regulates the main B+ voltage to the entire amplifier.

It is absolutely vital for everything on these boards to be working perfectly. We are starting to see original diodes fail in these 50-60+ year old amps. These kits help ensure bias voltage stability and reliability for decades to come.  For amps with solid state rectifiers, this upgrade is absolutely vital for stability and reliability of the entire amplifier.

This kit assumes the amp is also being maintained with a proper Electrolytic Recap Kit, which replaces the bias cap on this board. In addition to replacing this cap (vital!) as part of our ERK, use this kit to bulletproof the rest of the bias/ss rec board.