Heathkit TT-1 Mutual Conductance Tube Tester Antenna wire Great looking post war set

Great looking post war set

it belts out some great sound

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Heathkit TT-1 Mutual Conductance Tube Tester Antenna wire Great looking post war setThe Heathkit TT 1 is a classic, professional grade mutual conductance tube tester, popular in the 1960s for its accuracy in testing tube health (transconductance, leakage) by loading tubes like real equipment, unlike simpler testers. Key features include constant current heater supplies, an ultra sensitive grid current test, and a direct reading ohmmeter. The unit powered up and the meter responded appropriately to a line adjustment The needle falls