Quote:
Originally Posted by vts1134
The Horizontal problem was solved with the new 6SN7 in the horizontal oscillator.
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Wrong
!
Sad to say this was not my problem. I let the set play on my bench for a couple of weeks every night for a few hours with zero problems. I thought the problem was licked until I re-installed the chassis into the cabinet and the problem reared its ugly head once again. I couldn't believe it
. So once again I hauled the chassis downstairs to trouble shoot. Again if I play the chassis in the open cool basement air it will go for hours without a problem. What I had to do was give it a "cabinet" to get things heated up.
This did the trick and it displays the same symptoms it does upstairs in its cabinet. As the set heats up the horizontal drifts requiring an adjustment of the horizontal hold control. Last night I had it on for three hours and it needed to be adjusted at one hour and at two hours. It probably would have needed adjustment again if I could have stayed awake longer. It's not so much of an inconvenience to have to "bump" the control every hour when watching the set, but the drift never stops and eventually I run out of adjustment at the end of the control making the set un-watchable.
I have replaced C65 and C66 with no change. I will try C59 next. I have swapped V15 twice with no effect. All of my resistance measurements are within spec at V15. I'm kind of at a loss.
