When you insert banana plug to your multimeter,please adjust "mV",turn on power waiting about 5-10minutes,multimeter have "xxmV" exsample 40mV,that is you test tube current,and than test one by one."mV"test mode is safety for your amp than "mA" test mode,i have "mA"mode adapter also.
1pc Tube Adapter Amp Bias Tester for El34 6v6 6l6 Kt88 6550 Kt120 "mv" Test Mode
When you insert banana plug to your multimeter,please adjust "mV",turn on power waiting about 5-10minutes,multimeter have "xxmV" exsample 40mV,that is you test tube current,and than test one by one."mV"test mode is safety for your amp than "mA" test mode,i have "mA"mode adapter also.
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