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I finally figured out the wiring on a vintage King KX170B
Pulled a beat-up King nav/com from a junkyard plane last month for a side project. Turns out someone had jumpered the audio lines wrong, which explained the weird static. Got it cleaned up and working on my test bench with a basic signal generator. Felt pretty cool to bring a piece of history back to life. Now I'm hunting for a cheap scope to make these fixes easier.
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jenny_wright6mo ago
That audio line jumper fix is neat. What kind of signal generator did you hook up to your test bench?
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the_karen6mo ago
Signal generators are often overkill for audio fixes (just my take). A basic phone app can handle most tone generation needs.
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parkerr486mo ago
My buddy actually tried the phone app thing the_karen mentioned last year when his vintage amp was acting up. The app kept clipping and he couldn't get a clean sine wave to save his life. He ended up borrowing an old HP 3312A function generator from his uncle's garage. That thing was a tank, but it gave him the stable signal he needed to trace the problem. Sometimes the simple fix works, but his project needed the real tool.
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