From what I've been reading (books and forums), it doesn't have to be just the resistance that changes, does it? Or will that change first and indicate a change in other characteristics?
What I'm getting at, is from what I gather so far, a carbon comp resistor can act totally different when it's loaded and under high stress yet still measure relatively close to it's nominal value. Much in the same way that a transistor can check out fine from a dmm or even simple tester, but when hooked up to a curve tracer it will become apparent that the device has failed.
I could have misinterpreted what I've read so far, and I welcome corrections to my understanding & interpretation of info.
---In TekScopes@..., <jimmcintyre22@...> wrote :
No joy. The Service Manual Parts List calls out a 10 ohm series resistor in the heater, and that's what's in there. It measures 9.8 ohms. Re-checked deflection. Both X and Y are within 2%.
I'm still not convinced the 14kV is the only problem. This scope is new to me, and it could well have been 'mal-adjusted' to make up for the low PDA voltage. Still noodling on this. Continued comments welcomed...