Korean built 12" Sanyo tube-type B&W

[radiotvnut]

My computer is not being nice at the moment; so, pictures will have to wait a day or two.

The other day, a friend took me in a junk store that he spotted in a town about an hour away. They had a few '90's BPC sets, a mid '80's 19" knob tuned (rebadged goldstar) color Emerson, an '82 knob tuned 19" RCA XL100, an '86 Magnavox 12" B&W that I think was a rebadged Samsung, 3 or 4 beat up RCA consoles from the '80's, and the 12" Sanyo B&W that I ended up buying for $5. I would have bought the 12" Magnavox; but, it had a weak CRT and I decided to leave it there.

This set has a standard VHF tuner and the older non-detented UHF tuner. The volume, brightness, and contrast knobs are located to the right of the channel knobs. This set is very dirty and has some pieces busted out of the cabinet; so, it was probably in a major accident. I plugged it in at the store and seen that it had a good CRT; so, I figured it was worth $5. When I got it home, I discovered that it was made in Korea and the six tubes inside the set are all Sanyo branded Korean tubes. At home, I fired up the set with a signal and it had a good picture for about a minute or two. Then, the picture started pulling in from the sides and the HV faded away. After letting the set cool, it fired up with a picture and then faded out again. Since it's so beat up, I'm not going to spend any money on it; but, it should be interesting to see what's causing the horizontal sweep circuit to fail. This set uses a 33GY7 that is a combination HOT and damper tube. The problem could be the tube or any other part associated with it. I remember working on a mid '60's Magnavox 19" B&W that was doing something similar and it turned out to be a bad disc cap in the damper circuit.

I must say that this is the only Korean built tube set that I recall seeing. The model tag is missing; but, I found a Sams folder, from 1977, that covers a very close Sanyo. The set in the Sams has a click-stop UHF tuner, the controls are laid out differently, and the chassis only has 5 tubes where my chassis has 6 tubes; but, it looks close enough that I can use it to troubleshoot my HV problem. Since my set has the old style UHF tuner and is Korean, I'm placing it in the '74-'75 range. Any thoughts on that?