Dr Z Z-PLUS High Gain Retube Kit

These amps are cathode biased, there is no bias adjustment to be made. Typically in a cathodoe biased amp, the amount of clean headroom you’ll get from the power section is somewhat dictated by the grade of power tube used. A cooler grade of power tubes will give you more clean headroom, whereas a warmer grade will give you earlier breakup. However, in these amps the power tubes are set to run very hot and already have a good quantity of natural breakup, we usually pick out a cooler grade of power tube when we ship our retube kits.