Nobsound Vacuum Tube Amplifier Bias Current Probe Tester | 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-C, Cathode Current) Review

The centering pin broke immediately. I had to use the old tape trick to label the contacts but it works. Get what you pay for I think.

Absolute rubbish! It says plate current, not cathode, and when I received it one of the terminals was open. The lack of continuity gave me no clue. Don't waste your money.

Plugs directly into my Texas Instruments voltmeter and does exactly what it's supposed to do. If you're swapping tubes, oh, it's important to preload the power tubes.

I needed two of these for a Marshall Haze 40 which has a weird displacement system. And it works fine. It is of the same quality as the one I bought from a famous American pipe seller many years ago.

I bought this to fine tune the bias current on my EL-34 power amps. This eliminates the need to solder wires to measure current. This little gem works great and greatly reduces the chances of me dying from electrocution.

Makes it easy to measure lamp current without having to dig through wires and flip appliances and/or set up amplifiers to keep lamps clean and not bumping against countertops. I would have liked the cables to be a bit longer, but I used several extension cables and was able to measure without problems. Well done. The price is a little high just for the lamp socket and the short cords, but in my opinion it's worth it.

Centering pin broke immediately. I had to use the old tape trick to label the contacts but it works. Get what you pay for I think.

Plugs directly into my Texas Instruments voltmeter and does exactly what it's supposed to do. If you're swapping tubes, oh, it's important to preload the power tubes.