road side Sylvania Hybrid set

[Electronic M]

Well the HV has failed.

Me and a college buddy were tweaking it and had it displaying picture quality to rival any tube or hybrid I own (even convinced me to successfully fix the inter-carrier audio buzz). I went up stairs to get the folks so they could see it and while doing so my buddy tweaked the brightness control and it went dark.... It had about 20KV of HV before and about 5.5-6KV afterwards.

All the tubes test good and the voltages on the HO-Tube seem about right so I don't think that it is before the flyback....It still has a just barely perceivable raster that fills the screen so I think it might be the HV tripler. Any one have any ideas? This is the first set with a tripler I've worked on so I'm not completely sure how to troubleshoot it.

[DaveWM]

check the HV with the CRT unplugged.

[Electronic M]

I checked the HV with the HV lead disconnected from the CRT, and there was no change in the HV.

[Eric H]

Disconnect the wire from the Flyback to the input of the Tripler and see if you can draw a healthy blue arc from the Flyback to the tip of an ungrounded screwdriver (one with a good, insulated plastic handle) You should have (guessing) 5-8kv of AC at that point.

If you get a decent sized arc at the flyback but very little at the 2nd anode then my guess would be a bad Tripler.

[Electronic M]

Thanks for all the help and encouragement so far. Especially to Eric, your advice proved to be spot on.

I measured the HV from the fly in my B&K analyst found it to be 8KV and then drew a screwdriver arc off of it so I had a reference to compare the fly arc of the Sylvania to. The fly to tripler lead disconnected from the tripler terminal arced much stronger than the analyst so I decided to track down a new tripler.
An ebay search (after google returned random garbage) came up with this part which is specified as a sub in sam's. http://www.ebay.com/itm/NOS-Sylvania...item1c3677a431

I got it today and installed it...

Someone clearly soldered it to something in the past.

The Sylvania replacement is smaller than the GC (IIRC) original.

The screw near the focus resistor had to be moved to the intelligently placed hole nearer to center, but other than that no significant mounting changes were needed.

I decided to place the terminals up(it could also have been mounted in the same position as the original) so that those terminals won't be pointing at me during chroma ocs slug adjustments.

I may put caulk over the IN and Focus posts later for safety.

It now works like before(except I can't get the chroma to synch) ie. the HV hovers between 19-24Kv. I'm going to work on the chroma osc. and look for my HO Tube breakout socket so I can adjust the lin. coil for lowest HOT current.