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TAD Bias Master BM4

TAD Bias Master BM4

Measuring Device For Bias

  • Four octal socket adapters
  • For the control of the retirement
  • At 6L6GC, 6550, EL34, 6V6 GT, 5881, KT88, KT66, KT90, KT100, 7027A
  • With illuminated display
  • Made in Germany

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52 customer ratings:

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4.5 out of 5 stars
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5 Stars
33 Customers

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TAD Bias Master BM4

Robert814, 09.03.2014

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This model comes with 4 octal probes, but I ordered 2 noval probes as well so that I can set up EL84's as well as 6V6's and 6L6's etc.
WARNING! - There are no instructions! - If you don't know what you are doing, don't try to use this unless you have a friendly tech to show you. You can download them from the TAD site, [LINK] only 2 sides of A4 folded into a leaflet. Very basic instructions.
The probes each contain a 1 ohm resistor in the cathode lead, so they are measuring total cathode current (anode + screen grid). Circuit schematic diagrams usually state a bias Voltage (e.g. -37Volts) rather than current. This is a good starting point, but then you need to find the valve manufacturer's specifications from their data sheets. Then you can balance up each side of the push-pull stage.
The readout on the unit is 00.0 mA to presumably 99.9 mA.
A "Chicken head" pointer knob selects each of the 4 individual valves, or the OFF position.
It's really simple and easy to use (as another reviewer has said) and you don't have any high voltage connections to make through a test meter. The real skill is knowing just where to set the current level, which is of course different for each and every valve type and can be slightly tweaked for your preferred sound.

Decided not to keep it.

Ian294, 15.02.2015

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I bought this as an upgrade to my previous method of basing my amps which consisted of a multimeter and simple bias probe.
However I found that the BBM4 unit gave widely differing readings so I decided to revert to my old simple method of biaising and sold the Bias Master.
€144 £126.88
Price includes VAT, shipping costs extra
£ price - guideline price only
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item number 166243
sales unit 1 piece
available since December 2003
Total rating
quality
sales rank
in this category Rank 18
at thomann.de Rank 10839
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Offers include 20% British VAT and are valid as long as stocks last. Shipping costs to the U.K. are 10 EUR (approx. £7), free shipping on orders above 199 EUR. Please click here for international Shipping rates. We do not accept liability for typographical errors or inaccurate information of any kind. *RRP = manufacturer's / distributor's recommended retail price in Germany
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