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Bias 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.
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
Accessory Items:
| Probe Type | Our Part Number | UPC/EAN |
|---|---|---|
| Octal | S-TBM4 | 841358106163 |
| Noval | S-TBM4-EL84 | 841358106170 |
| Item Height | 2.1 in. | |
| Item Length | 5.76 in. | |
| Item Width | 3.6 in. |
| Packaging Dimensions | 8 in. × 5 in. × 3.75 in. | |
| Weight (Packaging) | Noval version | 0.922 lbs. |
| Octal version | 1.048 lbs. |
 Operation Manual | All Models |
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Questions and Answers
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1 answers
Can you bias an amp with a multimeter?
Asked by Anonymous on November 8th, 2017.
Yes you can but the bias meter simplifies the process and does the mathematical conversions for you.
1 answers
I received the bias master. However, I am surprised that the manual and inside did not mention that it can measure KT120 tubes unlike it is mentioned in your website. Please confirm that it can be used on KT120 or not.
Asked by Anonymous on April 12th, 2018.
According to the TAD site this measures KT120 tubes. You may want to contact them for confirmation.
1 answers
Does it come with a list of different amps to get bias numbers from ?
Asked by Anonymous on January 15th, 2019.
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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