Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34 KT88 6L6 6V6 5881 6550 KT66 KT100 KT120 7027 CT1C Cathode Current

How to use: 01. Turn off your amp. 02. Remove tube 03. Insert probe 04. Insert black banana plug in the COM jack of your multimeter 05. Insert red banana plug in the mA jack of your multimeter 06. Insert tube in the socket of the probe 07. Set your multimeter to the mA range (most common is 200mA) 08. Turn on your amp 09. Allow tube to warm up 10. You will get a direct reading in mA 11. Repeat in reverse 12. all done Packing List: 1 * cathode current probe (assembled for use)