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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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TAD Bias Master BM4 51% comprato questo prodotto
TAD Bias Master BM4
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54 Recensioni dei clienti:
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29 recensioni scritte. Leggi tutte le recensioni
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Perfect tool for easy biasing

17.05.2016
I bought this tool for my Blackstar Series One 104 EL34. I'm not an amp tech, but I've already done two successful biasing with it. The most important thing is knowing your new tubes, reading their specification usually mentioned on the producer website, and follow the procedure written on the manual. You have to be careful anyway, since there's dangerous currents inside any amplifier.
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TAD Bias Master BM4

Robert814, 09.03.2014
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.
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€ 149
IVA e € 20spedizioni escluse. Spedizione gratuita da € 298
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Telefono: +49-9546-9223-20
FAX: +49-9546-9223-24
Le offerte includono il 22% di IVA italiana e sono valide fino ad esaurimento scorte. I costi di trasporto per l´Italia sono di 20 EUR (isole escluse). Per avere maggiori informazioni clicca qui. Non rispondiamo di errori di digitazione o informazioni inadeguate di nessun tipo. *PPC = prezzo al pubblico consigliato dal produttore/distributore in Germania.
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