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It has now been wired to take a number of 9 volt batteries and a 1
to this great piece of history
5 cm) in diameter
This set sounds and display very well
Heathkit TT-1 Mutual Conductance Tube Tester Antenna wire It has now been wiredThe 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
US$ 118.03
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US$ 475.00
