Douk Audio Nobsound 8-Pin Dual Bias Current Probes Tester Meter for EL34 KT88 6L6 6V6 6550 Vacuum Tube Amp Amplifier (2*Meter + 2*CT1-C, Cathode Current)

Worked well. I built a Guitar amp from a kit. The 66 Fender Deluxe Reverb. This device made tube bias of the 6V6 tubes a breeze.

Used it to check a Fender 5e3 pair of 6v6 bias current. Measured exactly the same as my digital multimeter.Only thing I would love or need to do is to acomodate it inside a project box for better handling protection.

I used this to adjust the bias on my Soldano SLO 30 and it worked great. I checked the accuracy with my multimeter before I trusted it the first time and it was right on. Cheap and easy to use, now I can check the bias on my 3 tube amps! The only thing like someone else mentioned was it doesn’t have any kind of box or cover on the back side area of the meters, but works fine how it is.

The device does not work. The right meter is stuck at 10ma when not in use and even if you try turning the adjustment screw it wont go down to zero. When I turn on the amp the left one reads 60mA and the right one reads 45mA, and when I swap the cables the right one still pegs at 60mA and the left at 45mA

After struggling with a multimeter I finally ordered this and can’t be happier. No more fiddling with leads, the analog meters clearly show you what the current value is and where you want to go! So much easier to dial in the bias. So nice to see both tubes on this model in order to balance the circuit, can’t say enough how much this helped.