AMPTATA M2-300B Amplifier Vacuum Tube Bias Cathode Current Tester mA Version Tool For 300B 2A3 101D 102D VT25 VT52 275A 6A3 71A 801 201 26 10 50 250 45 75 205 104

• M2-300B suitable for 300B 2A3 101D 102D VT25 VT52 275A 6A3 71A 801 201 26 10 50 250 45 75 205 104 etc.
• M2-300B test tool is through multimeter get tube's mA
• Measures the cathode current of the power tube for bias reading (at low voltage side of the tubes )
• High-Quality 24K Gold Plated Banana Plug Male Speaker Cable Connectors
• M2-300B wire length about 65cm. Bakelite socket and plated Gold for long life

M2-300B wire length about 65cm M2-300B test tool is through multimeter get tube's mA For matching vacuum tube M2-300B suitable for 300B 2A3 101D 102D VT25 VT52 275A 6A3 71A 801 201 26 10 50 250 45 75 205 104 etc. How to use: Turn off amp remove tube and put tube into this M2 test tool socket M2 two banana plug insert multimeter Set multimeter to the mA range (most common is 200mA) Turn on amp let tube warm up wait about 1-2 min Multimeter will show up tube's mA reading