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| Heathkit Capacitor Tester IT-22 from 1965 |
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| Spartan1:
Hello fellow techies. I recently bought a Heathkit Capacitor tester it-22. Noticed weird readings from the eye. Decided to pull it apart and basically do some voltage tests first. This transformer in it is a 240v instead of the 125v in the circuit diagram I have posted. The main concern I have, are the outputs of the transformer are different to the circuit diagram. 1) My transformer output is 14v Should be 12.6v. 2) Next transformer output is just over 600v. Should be 540v. 3) Next transformer output is 58v. Should be 55v. Wondering if these wrong readings are acceptable for the 1629 tube. Thanks in advance :-+ |
| wasedadoc:
I'd be tempted to put a suitable series resistor in the tube heater supply. |
| BrokenYugo:
C1 is likely a "death cap" and should be replaced with a class Y safety cap. Other leaky paper caps probably causing the behavior issues. Might be more like a 220V primary, good enough if it runs cool, though filament/heater should be within 5% for good cathode lifespan. Wasedadoc's suggestion of a dropping resistor for the heater is a good one. |
| Wallace Gasiewicz:
I do not think the filament voltage would cause immediate problems but high voltage here might shorten the tube life. Did you measure across the filament wires? The schematic calls for a VTVM, so I think a high impedance modern multimeter should be adequateAlso take the volt readings with a grain of salt. Notice the primary to the transformer has quite a volt range specified. Quite common for line voltages to be specified this way since they did vary even more than that specified. The secondaries will be affected also although they do not specify a range. I know that you are using 240. What sort of magic eye problems are you experiencing? Edit : https://www.radiomuseum.org/tubes/tube_1629.html |
| Spartan1:
--- Quote from: Wallace Gasiewicz on May 16, 2024, 02:32:26 pm --- What sort of magic eye problems are you experiencing? --- End quote --- Hi Wallace, I was getting the same readings using a new electrolytic capacitor, and a faulty swollen electrolytic capacitor :-DD Showing good for both capacitors. Not shorted and Not open :-// |
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