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Double Checking a Power Transformer
I'm working on rebuilding an RCA 1YB11 tape cartridge recorder. On my first power up after replacing the paper caps, I melted my power transformer. It was running on the old electrolytics, which, yes, lesson learned. 80 dollars later, Heyboer sent me a new transformer, which I'm about to wire in.
My issue is the resistance values on the transformer coils aren't matching the schematic. The schematic shows three coils - one at 28 ohms, one at 75 ohms, and one without a resistance marked which I assume means it has little to none. My transformer's three coils are measuring 90 ohms, 20 ohms, and less than one ohm. Close, but not exact. It's not wired in, and I'm measuring it cold. Am I risking damage when I wire this in, or is the discrepancy within tolerable levels?
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To keep your tubes running smoothly, make sure to dust underneath the glass as well. |
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