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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Tube Tester Servicing posted by PRM on March 14, 2007 at 11:32:40:
Per the tester's Manual, you calibrate it yourself each time you use it (didn't you bother to read it yet?). And as to service: 1) simply clean the switches & sockets with Caig's in a normal manner (search this asylum), 2) replace the one electrolitic-construction capacitor & 3) perhaps the internal vacuum tube. Done. I suppose it is also possible a well-used socket may need replacement, or a drifted-in-value resistor if the meter cannot be set to Cal(ibrate). But the schematic is pretty simple & @ back of Manual. If the Manual & separate tube charts are not included, it is pretty much useless. However, some Sencore Manuals are on-line for free download (see the Asylum FAQ, tubes section, tester articles for a Manual link) & I sourced a copy of the tube charts for mine by watching Ebay auctions & offering the seller an extra fee for the copy service prior to auction end. In use however, your restored Sencore will be not much more than a novelty as it will pass many tubes that will not work well in-circut & cannot match power tubes or dual sections. What it was good for, was quickly spying a failed tube in a two-dozen-tube Television set during house calls, rather than critical audio Hi-Fi selection. IOW, your own amplifier can tell you more of what you want to know, & an ordinary multi-meter can check for shorts. Good luck, Ron.
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- You can - Ron Oehlert 18:44:09 03/14/07 (0)
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