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Originally Posted by Tubejunke
By mentioning the 3.58 oscillator tube, do you mean the "Chroma Reference Oscillator?
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Yes. What is the tube type (designation)? Since you don't have a known-good sub, how good is the emission on each section of the tube? Try dropping the heater voltage a notch (some testers have a feature called "life test" which does this). Does emission drop dramatically and then come back slowly when you restore full heater voltage? If so, it would suggest the tube may be borderline in oscillator service. Is each section free of shorts and/or gas?
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...I will get back to the issue with the horizontal efficiency coil with what seems to be a broken backbone or housing. In short, I would think that it should be rigid, but I can grab the coiled end and it wobbles around separating the windings a bit.
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Yes, that coil form should be rigid and not wobbly at all. It crystalizes from heat and gets crumbly over time. Are you monitoring the HOT cathode current? It may be high since the coil is no doubt detuned from the 'dip' it was originally set to.
In Zeniths, the plastic coil forms on the convergence panel are also prone to crumbling and getting wobbly.
Bill(oc)