|
I got it a little better, but still has the same issues. I think I know why, just about every resistor is 20 to 30 percent too high. This has to trow off most of the circuits and adjustments. I changed the 6GY6 plate resistors awhile back, they were almost twice the resistance, actually I think one was open. This seems strange as this is a low hour set, it had all the original tubes and the picture tube comes up fast. I tried a resistor across the .047 cap, it throws everything off way too much. Even with a 2M resistor I got 120V green grid, 100V blue, 60V red, so I'll do without that. Normally all the grids are around 60V, the cathodes around 230V, the screens all around 650V.
It has a decent picture, wish I was capable of doing a convergence setup as it's way off on one side. I also noticed the 22 inch crt in the schematic, it seems possible this chassis has a hard time keeping up with a 25" crt. I showed it to a few people who have seen tube TV and they said it has a good picture. I have to remember this was when color was new thing and not perfected. I may be expecting more as I grew up in the late 80's early 90's when they had perfected and refined the circuits.
I do notice it handles older TV shows fine. It has trouble current TV, loaded with flashy graphics and fine text, basically anything that didn't exist when the TV was built. I still find it amazing how they built these things like this, with all the adjustments (65 to 75 total, I counted), and the off tolerance resistors, and tubes, but yet it still produces a decent picture.
I wish I could get my hands on a bit higher end model tube TV, but there are almost none here. Where I live, people consider a vintage TV anything that isn't a flatscreen. The local thrift shop was selling early 2000 CRT TVs for 10 bucks, some digital ready, all working pretty good and it took them a month to move them. Can't sell a working TV for the price of a pizza? I don't get it. Around here, if it's not an LCD nobody wants it.
I'm thinking this TV is working about as it should so I'll leave it at that.
Thanks everyone.
|