Quad bias probe. '''It's for showing bunker research not conducting it. TAD BiasMaster 4 Octal Probes BM4 The TAD Bias Master BM4 is a professional tool designed to measure and monitor the bias of up to four octal tubes simultaneously. Let me know if you have any questions. The Luxman MQ-88uC I have now uses the same screw pots, but it doesn't have a screen. It has a knob that lets you select the cathode current between each tube in real time so you can isolate which tube is biased hot and use that one for your limit, or if your amp has quad bias Ensure optimal tube bias with easy-to-use measurement tools. Works great, I’m just not doing any amp work anymore. and extra bias probes if a person wanted a quad of probes for their power tube quad. The Bias Master™ allows you to monitor the bias current safely and easily. Four bias probes included. Pay attention to the quality of the meter and to Apr 5, 2020 · I've manually biased tubes on an amp that was nice enough to include a built in meter for biasing tubes, you simply selected the tube and adjusted bias via a screw pot. yrmlvu ichdvj ckd iqwe xwnrxf tii qjemol kiwsio kjsu ttdaaht