Tube Amp Doctor BIAS Master System BM4 4 Sockel, EL34 Typ

The Tube Amp Doctor BM4 Bias Master measures the BIAS current of any 6L6GC, 6550, EL34, 6V6GT, 5881, KT66, KT88, KT90, KT100, KT120, 7027A etc. in your amp. 
 
The BiasMaster(TM) allows you to monitor the bias current safely and easily. While adjusting the Bias control pot of your amp the BiasMaster(TM) responds instantly indicating accurate readings.
The Bias setting has a dramatic impact on the amps response, break-up and dynamic character.

The main features of the Tube Amp Doctor BM4 Bias Master include:

• Measures Bias Current in Tubes and Valve Amps
• Four Octal Socket Adaptors
• Fits most standard amp valves