Dual Bias Current Probes Tester VU Meter for EL34 KT88 6550 Röhrenverstärker Amp
This product is suitable for EL34,KT88,6L6,6V6,5881,6550,KT66,KT100,KT120,7027. It measures the cathode current of the power tube for bias reading (at low voltage side of the tubes ).You can Get the reading direct from the current meter.