[bgadow]

I've been trying to tackle some of these sets which I have left half finished. This one I just wrapped up so I'll share. I bought this about 8-10 years ago from a local fellow who also had a Predicta. I bought the pair for less than $100. This set was in working order (I only needed to clean the tuner) but it soon developed an intermittent in the vertical. Then the vertical went out completely. At that time (2-3 years ago) I replaced the electrolytics & recapped the vertical circuit, to no avail. Now, with more experience, I dug back into it. At first I suspected the osc. transformer but I found a spare & swapped them with no change. Then I did the trick of running a cap between the filament & the grid of the vert osc. tube & there was no drive. A check of the vert output transformer showed the primary was open. I posted on here and Charles (Kaye-Halbert) came through. With the new part installed I had deflection but poor sync. This took some investigating. It seems that when I recapped the circuit I included a pair of mica caps. Luckily I had saved them. With no schematic on hand I couldn't know for sure but checking the color codes I saw I had messed up. What I thought was a .068 was a .0068 while a .047 was installed in place of what I think was a .00047. It doesn't matter what the values were supposed to be-they were wrong, I had the old micas, so I reinstalled them and the vertical looked right again.

The remaining problem with the vertical section was more dumbness on my part. When I unclipped the old transformer I forgot where the B+ line was connected. The likely places were a line at 290v and another, B-boost, at 400. I finally found a schematic for another set using this same transformer which showed a voltage of 275 so that set me straight. I still wonder if I chose the right place. The set has a hum in the audio which seems to be connected to what the vertical is doing. It's not real noticeable except with the volume down. When I finally get a copy of the schematic I'll know for sure.

One more odd thing-reception had always been good with this tv but when now I could barely pick up the signal from my vcr tuner. I knew the vcr worked okay because the Emerson a few posts back is being fed from it. This took a few nights to figure out and it was a new one on me-the matching transformer was defective! Yeah, just one of those cheap 300-to-75 ohm thingies. If I undid one leg it pulled in the signal clear. Into the garbage it went. This set is now a reasonably good performer again.