You may have difficulty directly measuring the 3A3 filament voltage, because it is a high frequency (15.7 kHz) and pulsed waveform.

Most AC voltmeters won't read correctly on non-sinusoidal signals. And of course, if the 3A3 plate cap is connected, the filament is floating at HV to ground.

We have liftoff!
 

Thanks for the info, I'll keep that in mind for future reference.

Problem solved. There was a VERY loose transistor on the horizontal output board. One leg wasn't being gripped at all. I re-seated the board just for good measure, stuck a piece of wire beside the loose pin, powered on and presto, the HV was back. The picture is awful and barely holds sync in either direction, but hey, she's a runner. The piece of wire can barely be seen in the photo.

Edit: Later on it lost vertical sweep. The fellow I got it from did say it has a vertical problem.

Thats about how poorly the local LPTV (ch4- Hispanic) comes in around here.

Still no vertical sweep on the 370, this one's a bugger to figure out. There was another vertical module in the cabinet which I swapped in with no difference so I re-installed the other one. Eventually I heard a pop and a hiss but didn't smell anything and the TV kept doing what it was doing.

Most likely a electrolytic went bang check caps for signs of venting. All the best,Tom.J

That's what I thought, thanks Tom. I'll have to move it and the GR-2000 before I can get a really good look behind it. I've had caps go up before and can recognize the smell and the smoke but I got neither in this case. I'm guessing the sound came from one of the multi-section cans.

No vertical sweep check using scope for drive signals and also check pin. board for faults open on pin board will kill vertical sweep. All the best, Tom.J

Wow! I can't believe you scored those sets. I have a Gr-2000 that my grandfather built in the late 70's. In 25 years of tv repair I have never seen another one. I will take a picture of the cabinet when I visit my mother's house next time. I also saved all the assembly and troubleshooting books from when the set was built. It would take me a little time to dig them up and scan them in but let me know if you need anything.

Yeah, that would be great! :) Yeah, I can hardly believe it either. What's even crazier is that I got four big sets in five days, I doubt I'll break that record. What's next, a whole mess of NOS delta CRTs? Haha.

By the way, does anyone have a schematic at least for the GR-370? The thing's full of ham-fisted repair attempts so in some cases I don't know what original part values are. For instance, there's a big mess of electrolytics soldered together on the convergence board where there's supposed to be one. Also, there were two Sprague caps that go who knows where... come to think of it they're probably not original to the set, it's probably too old to have came with orange drops.

The cap that went bad in my GR2000's vertical board was C534, a 250uf. But it just quit without any smoke or smell.