Heathkit TT-1 Mutual Conductance Tube Tester Antenna wire It now has Bluetooth and

It now has Bluetooth and FM functionality with aux input or Bluetooth transmitter

Great looking post war set

it belts out some great sound

It has now been wired to take a number of 9 volt batteries and a 1

This set sounds and display very well

Heathkit TT-1 Mutual Conductance Tube Tester Antenna wire It now has Bluetooth andThe 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