Quote:
Originally Posted by Aperna1985
The 6gh8 is actually a Zenith tube possibly original.
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Zenith didn't make their own tubes they usually sourced them from Sylvania and then had their name slapped onto the tube.
But I would guess that it probably is an original if not the second to original tube to the set (if the original owner of the set used Zenith Branded tubes as was suggested by Zenith back then on their TVs and radios.)
Was this the Zenith "Bugeye" TV? If so I had worked on one of these once and that was a pain in the butt TV to work on but when I got it going it worked really well.
With Horizontal or Vertical circuits the oscillator tubes need to be pretty much brand new (NOS) or else you're going to have oscillator stability issues in the vertical and horizontal sweep circuits because they are critical circuits.
I would definitely try getting some NOS tubes for the TV and try that out and see what that does with your TV.