Heathkit TC-1 Tube Tester Restoration Part 2
Heathkit TC-1 Tube Tester Restoration Part 2 Filed in Heathkit TC-1 on Nov.09, 2018 Part 2 – Testing the Transformer In Part 2 of this series, I’ll check out the transformer in the tube tester. This is the heart of the unit, and if it is not good, then the project will be scrapped. Test Locations for Filament Readings Filament Selection Actual Voltage 0.75 0.77 1.40 1.54 2.00 2.11 2.50 2.69 3.30 3.46 5.00 5.18 6.30 6.74 7.50 7.88 12.60 12.87 25.00 26.58 30.00 33.66 50 - 60 52.60 70 - 80 73.70 100 - 115 115.20 As you can see, the filament windings all appear to be intact. Most are reading a little high, as would be expected with no load. 12.6 volt filament reading – no load Next is to check the high voltage windings – 30v, 100v and 250v. For all three of these, the common lead is the right hand lead of the Plate Voltage potentiometer. The one with the red lead soldered on it. ...