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Tube Amp Doctor (TAD) - TAD is a German company established in 1993 which selects and matches electronic tubes and manufactures musical instrument accessories.
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S-TBM4-XBias Master™ - TAD, tube tester, with 4 probes

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.


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S-TBMA2-XProbes - TAD, for Bias Master™, set of 2
Package of 2

Bias Master™ set of adapter probes for testing other types of tubes. For use with the S-TBM4-X Bias Master™ system.


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