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Bias Probes - Eurotubes
https://www.eurotubes.com/store/pc/bias%20probes.htm
The ET “Pro One” Bias Probe is again unique and designed to allow you to play the amp while the probe is installed. This will allow you to bias where you like it best, usually between 65% (multiplied by .65) or even as high as 80% (multiplied by .8) When playing the amp the bias current will jump wildly as the tubes work and you may see the meter signal “OL” which stands for …
Amazon.com: bias probe
https://www.amazon.com/bias-probe/s?k=bias+probe
Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-C, Cathode Current) 4.3 out of 5 stars. 50. $16.99. $16. . 99. FREE Shipping on orders over $25 shipped by Amazon. Only 1 left in stock - order soon.
Amazon.com: Nobsound 8-Pin Dual Bias Current Probes …
https://www.amazon.com/Nobsound-Current-Probes-Amplifier-Cathode/dp/B0777F8DBK
Remove the power tubes and Insert the power output tubes into the bias probe sockets. Then Insert bias meter probes into the tube sockets of the amplifier. Turn on your power amp and let the tubes get warm about 5 minutes.Read the bias measurement. Current meter "A" is reading "A" input, and the Current meter "B" is reading for "B" input.
Dual bias probe tool tester for biasing tube amp amplifier ...
https://reverb.com/item/24983689-dual-bias-probe-tool-tester-for-biasing-tube-amp-amplifier-srs-made-in-the-usa
This dual unit can check two tubes at one time with one meter, without the need for powering down, waiting to cool, and switching to a different tube. Great for any tube amp, including vintage CBS-era Fender amplifiers with "bias balance" circuits- saves time and sanity. Works with 5881, 6550, 7027, 8417, 6V6, 6L6, 6CA7, EL34, KT66, KT77, KT88, KT90, and many more- if you are …
Eurotubes Bias Probe Instructions
https://www.eurotubes.com/store/pc/bias%20probe%20instructions.htm
the formula for biasing is the plate dissipation of the tube (12 watts for standard el84’s or 9 watts for the jj el844’s) divided by the plate voltage (let’s use 350 for this example) times .7 will just get you out of crossover distortion and you can go as high as .85 percent but you will wear out the tubes quicker! 12 watts divided by 350 = .034 …
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