#1
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Bummer: VTVM
On an earlier thread I recapped an Eico signal generator that I had bought at a yard sale along with a Heath VTVM, total about five bucks for the two. Today I decided to tear into the VTVM, which didn't work.
The case on the outside looked good, the panel almost perfect, good meter face. The case on the inside had some bad rust problems on one side but that could be fixed. Somebody had left a cell in for a long time and there was corrosion, also could be fixed. But checking the meter terminals with the highest setting of an ohmmeter, I got open circuit. I dug into it and actually was able to get the movement out of the meter case (not easy, they use watchmaker hardware.) Checking right at the coil terminals, the meter was shot. Phooey. I harvested the pots and their hardware, knobs, and the power transformer and chucked the rest. I'm in no rush to find one and will stumble across another some day, I'm sure.
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Reece Perfection is hard to reach with a screwdriver. |
#2
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Nuts, that sure is a bummer. Which model was it ? The 221 and 232 seem to be fairly common.
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#3
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It was a V-7A.
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Reece Perfection is hard to reach with a screwdriver. |
#4
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Oops - I was mixing up your Eico sig. gen. and Heathkit VTVM
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#5
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Seems just about any similar sized meter would do - most common VOM/VTVM meters are 2000 ohms internal resistance and 50uA sensitivity. RCA, Heath, Eico, Triplett, Simpson, and Superior all made similar VTVMs that included the battery for Ohms source and a 12A_7 for higher impdeance on the voltage scale. Check fleabay - those Heath meters come up all the time.
Cheers,
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Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
Audiokarma |
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