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Bias Master™ system BM4 Measures Bias current of the vacuum tubes in your amp. Includes 4 probes and english/german operation manual.
The Bias Master™ allows you to monitor the bias current safely and easily. While adjusting the Bias control pot of your amp, the Bias Master™ shows the actual result. This lets you set and evaluate the full reasonable biasing range your amp and tubes offer to find and set your personal perfect choice.
The Bias setting has a dramatic impact on the amp's response, break-up and dynamic character.
For additional probes (for testing other types of tubes), see S-TBMA2-X
Andrew S. Blasko III
Reviewed in the United States on February 26, 2022
My son needed new tubes in an older Marshall guitar amp and I purchased the Bias Master to set the tube bias. Very easy to use, and good quality. I expect this meter will be the only one I will ever need to buy.One word of advice on any battery-powered piece of equipment: if you aren't going to use it for a while, take the battery out so it doesn't leak and ruin the meter. I learned this the hard way many years ago.
J. Heiskell
Reviewed in the United States on February 13, 2021
Works like a charm! Saves a bench fee every time you bias an amp, and pays for itself in 2 uses! Awesome piece of equipment that everyone should have!
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