Dual Bias Meter BM-5-Octal
Dual Tube Amplifier Bias Meter. It measures the cathode current of the power tube for bias reading (at low voltage side of the tubes). Tests EL34, 6L6, 6V6, 5881, 6550, KT66, KT88, KT90, KT100, KT120, KT150, 7027. Two bias probes included.