My first roundie, ctc 16

[Charlie]

Originally Posted by Findm-Keepm

Their use in color circuits was probably a stretch - they were originially designed as horizontal oscillator tubes. There's a big difference in 15,750 Hz and 3.575945 MHZ!

I've wondered if 6GH8's were used for anything other than color circuits. Don't recall off hand if I've seen them in sets doing other jobs. My "used tube" buckets always have a lot of them in there.

I attempted getting my color to lock in on my 15 years ago by replacing the 6GH8... must have gone thru 3 or 4 before finding one that finally worked... and they were all NIB tubes.

[peverett]

I have seen GE B&W sets that used 6GH8s as horizontal oscillators. Zenith may have also used these as horizontal oscillators.

[zenithfan1]

Originally Posted by peverett

I have seen GE B&W sets that used 6GH8s as horizontal oscillators. Zenith may have also used these as horizontal oscillators.

I think Zenith did use them in some of the 70's B/W hybrids for a horizontal oscillator IIRC.

[Findm-Keepm]

Originally Posted by Charlie

I attempted getting my color to lock in on my 15 years ago by replacing the 6GH8... must have gone thru 3 or 4 before finding one that finally worked... and they were all NIB tubes.

'tain't just tubes that have personality conflicts - on of my laptops suddenly died. I popped out one of the memory cards and it worked just fine. In fact it worked with either, but not both. Had to replace them (they were the originals) to get the computer to work as it should.

If you think 6GH8's are bad, the 5GH8 was no better - and between RCA and Westinghouse/Penny's sets, there were plenty. I've seen many a RCA 19" color set fixed by just moving 5GH8's around between the sync/color/horiz circuits in the set.

When I worked at an electronics distributor in the early 80's - we sold 6GH8's by the sleeve of 5 - not because the shop needed to replace that many, but because they need that many to replace one - Charlie, it seems, you too!

[DaveWM]

I would check the RF tuner tube 1st as well as some new IF tubes before going anywhere near an alignment.