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Sorry for not responding sooner. Tomorrow I'll show you the dame procedure using the Sencore. It's not complicated. Choose the right socket, set filament volts to 6.3v, turn the multi test select dial to check for HK shorts, then select the che k for G1 shorts, then select "Gun Balance" (this is Sencore's term for cutoff) and watch the needle deflect. If it doesn't move, little or no cutoff. NOS 10BP4 tubes deflect the needle to the midpoint of the scale "12 O'clock) To check emissions you turn the gun balance pot so the needle goes back to essentially zero then you measure emissions. It's a commercial diagnostic product. A well deflected needle in Gun Balance mode means good cutoff. A needle that doesn't move means little or none. The bad one doesn't move the nee, the good one deflects it 1/3 up the scale.
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