To EHT, or not EHT?

[Down Under]

Originally Posted by DaveWM

yes HOT to me is Horz Output Tube, I refer to the horizontal output transformer simply as the "fly or flyback"

Too bad you do not have a TV analyst, I find them helpful for quick trouble shooting of HV. I doubt its a couplate if the grid signal is still good with the yoke attached.

Thanks, it makes sense that you're talking about the tube when I think about it. I don't think the flyback has a screen! I'm looking into an analyser as we speak on eBay, we can't seem to get them here so it'll be a US Sencore. No matter, I use the same tranny to power up my Predictas, my BK747 tube tester and soon possibly the Sencore!

[DaveWM]

the BK 1076 or 1077 have a lot of utility, there is a test patter, gated color bar,RF/IF/Video and for sweep circuits it has a plate drive (you attach the plate clip from the fly to it to see if the fly/damper/yoke is ok) and grid drives for both vertical and horz. You can live without it, but I find it handy, and besides I am an equipment junkie...

[Down Under]

Hi Dave, thanks for your tip about the HOT. I measured pin 4 from the wiper of the width control and it was reading -1v. As it turns out, the width pot is no good, so it's off to the fun store this weekend for parts. After a bit of contact cleaner, I was able to get a very small raster with bottom foldover, but the boost volts are only reading 265 (should be 400) and the 260V to the other terminal of the width pot is reading low. (I have had it reading at the correct 260V in this session, so something is intermittent)

The EHT is too low as well, a huge hole in the pic and blooming. The telltale small arc from the fly was also a bad sign. I'll check over all the pots this weekend and see what happens. I also have the final 4 electros I need to replace the large can near the vert OP tranny on their way. Thanks for your input, it's certainly a step in the right direction!