Quote:
Originally Posted by kx250rider
I worked on many CTC-7s, and I'd recommend for accuracy, to remove the part about testing all tubes. No TV repairman would have done that, as it would have wasted a lot of time.
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On house calls, that's absolutely correct. However, most road techies would routinely give all the tubes the 'tap test' to reveal any borderline intermittents and arcing damper tubes (a
very common problem). Weak tubes could often be identified by turning the set off for about 10 seconds and then back on. A lag in horizontal lock-in would reveal the oscillator tube becoming weak, a lag in color sync lock-in showed a weak color osc. tube, slow width fill-out showed a borderline horiz output tube, etc. For house calls the old adage was that the set itself is the best "tube tester".
But in the shop, all the tubes were routinely tested on a tester unless the customer specifically requested a cut rate.