A friend of mine has an emission tester (maybe it can put some signal on the grid - I haven't seen it in a while.) I've got a hickok machine that you look up t

A friend of mine has an emission tester (maybe it can put some signal on the grid - I haven't seen it in a while.) I've got a hickok machine that you look up the grid bias in the chart and can receive a reading in ... micromhos? Ok that implies conductance but that's a strange unit. I'm not sure these are "instruments." My treasure is a machine from soviet russia, it actually uses a signal generator to feed the grid, and measures transconductance in mA/V. It's got a bunch of power supplies, VTVM and microampere meter whose smallest scale resolves some nanoamperes, so I trust its methodology. It's nice to find the actual current passed by a rectifier tube instead of setting a meter bias knob to read out the 'strength' on a unitless 0-100 scale. But I never figured out how to intereperet the "?" on the emission testers. My tube fap shrine won't be complete until I get a Tek 575 though.