Posts Tagged ‘Vintage’

Heathkit TC-1 Tube Checker – Theory of Operation – Filament Check

The TC-1 uses a neon bulb to sense relatively higher current flow in the plate circuit of the tube under test.  It uses this function in order to detect short circuits between the various elements of the tube. It uses this same circuitry to test whether a filament has continuity or is open.  To set […]

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Heathkit TC-1 Tube Checker – Theory of Operation – Line Set Mode

Theory of Operation: Line Set Mode In Line Set Mode, the TC-1 is set up to measure the 115 volt winding of the transformer, and set it to 115 volts, regardless of a variation in the line input voltage.  This allows the checker to give valid go/no-go checks of tube emissions even if the line […]

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Heathkit TC-1 Tube Tester Restoration Part 10

Part 10: Operational Testing With the TC-1 Tube Checker electrical restoration complete, it was time to run through a few tubes to see how it works… Step 1: Set all controls for startup. Set Line – Center Range Type – 1 Filament – 0.75 Plate 0

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Heathkit TC-1 Tube Tester Restoration Part 9

Part 9: Cabinet Restoration The cabinet was a little beat up, but not in too bad of condition mechanically.

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Heathkit TC-1 Tube Tester Restoration Part 8

Part 8: Initial Testing The moment of truth has arrived.  Will it thrive, or go up in smoke?? I plugged the newly reassembled TC-1 into my variac to bring up the voltage slowly.  Before powering on the unit, I put the controls in the following positions: Set Line: Full CCW Filament Voltage: 0.75v Lever switches: […]

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