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

Tube Amp Doctor (TAD)
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Bias Master™ - TAD, tube tester, with 4 probes

$200.21
Save 11%
Originally: $224.95
In stock

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

SKU:
S-TBM4-X
Item ID:
039836
Brand:
Tube Amp Doctor (TAD)
Part Numbers
Probe TypeOur Part NumberUPC/EAN
OctalS-TBM4841358106163
NovalS-TBM4-EL84841358106170
Product Measurements
Item Height2.1 in.
Item Length5.76 in.
Item Width3.6 in.
Packaging Information
Packaging Dimensions8 in. × 5 in. × 3.75 in.
Weight (Packaging)Noval version0.922 lbs.
Octal version1.048 lbs.
PDF: Operation ManualAll Models

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Specifications, Files, and Documents

PDF: Operation Manual Operation Manual67.08 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on November 8th, 2017.
Matt H
November 8th, 2017
Yes you can but the bias meter simplifies the process and does the mathematical conversions for you.
Asked by Anonymous on April 12th, 2018.
Matt H
April 12th, 2018
According to the TAD site this measures KT120 tubes. You may want to contact them for confirmation.
Asked by Anonymous on January 15th, 2019.
BradWbr
January 16th, 2019
Staff Member
No, such a list is not included with this meter, but we have provided a bias calculator that may be of assistance: https://www.amplifiedparts.com/tech-corner/tube-amplifier-bias-calculator

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