Tube Amp Doctor (TAD)

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Bias Master™ - TAD, tube tester, with 4 probes

Bias Master™ - TAD, tube tester, with 4 probes image 1
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SKU: S-TBM4-X
Item ID: 039836

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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.

Probe Type Measures
Octal 6L6GC, 6550, EL34, 6V6GT, 5881, KT66, KT88, KT90, KT100, KT120, 7027A
Noval EL84 types

For additional probes (for testing other types of tubes), see S-TBMA2-X

Part Numbers
Probe TypeOur Part NumberUPC/EAN
OctalS-TBM4841358106163
NovalS-TBM4-EL84841358106170
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Specifications, Files, and Documents