22-08-2025, 06:19 AM
Pye 12G-1 B&W Television. Chassis T25-4A
Hello all. My next attempted repair/restoration is the above listed set from around 1970. It was designed and made in Australia, and I am sure that I have never worked on another one any time in the past. This is because of the unusual cabinet. to service the set one removes the rear cover, but it is best to also remove the front of the cabinet as well.
I had this little set lying around for a few years before I finally had time to take a look at it. Now that I have retired, I no longer have to wait for a weekend to warm-up the soldering iron.
I started by reforming the electrolytic capacitors as best as I could, then cleaned out decades of dust. I wanted the set to look good whether it was to be a working set, or a display only set.
I cleaned the potentiometers, and measured the E.S.R. of the electrolytic caps. None were faulty. I then removed the tuner to clean the contacts and repair a broken feed through cap that couples the aerial lead to the internal balun. Because the channel knob had no channel markings on it, I set the tuner turret to the CH-1 position and and remounted the tuner marking the ch-1 position on the knob/cabinet. Next I removed the broken telescopic antennas, and glued some cracks in the cabinet.
Finally I powered up the set. I fed a signal to the set from a ch-1 modulator, and adjusted the controls to get a stable picture. The picture was alright but not great, My picture tube tester said that the control grid (No.1) was open circuit. Odd. the brightness and contrast control worked! Some type of electrostatic coupling? The black to white transitions look as though someone is holding the cathode lead. Low high frequency response.
The tuner's local oscillator seemed to be running a little low. I could not quite tune to sound bars. All the channels that I tried did not quite tune to sound bars.
At this point I decided to give up on this set. Too much wrong.
By the way, I have many photographs of the items that I work on, but I do not have much luck uploading them.
If there is someone good at posting photos, I could e-mail some photos to them and let them select which and how many pics to post for each project.
Hello all. My next attempted repair/restoration is the above listed set from around 1970. It was designed and made in Australia, and I am sure that I have never worked on another one any time in the past. This is because of the unusual cabinet. to service the set one removes the rear cover, but it is best to also remove the front of the cabinet as well.
I had this little set lying around for a few years before I finally had time to take a look at it. Now that I have retired, I no longer have to wait for a weekend to warm-up the soldering iron.
I started by reforming the electrolytic capacitors as best as I could, then cleaned out decades of dust. I wanted the set to look good whether it was to be a working set, or a display only set.
I cleaned the potentiometers, and measured the E.S.R. of the electrolytic caps. None were faulty. I then removed the tuner to clean the contacts and repair a broken feed through cap that couples the aerial lead to the internal balun. Because the channel knob had no channel markings on it, I set the tuner turret to the CH-1 position and and remounted the tuner marking the ch-1 position on the knob/cabinet. Next I removed the broken telescopic antennas, and glued some cracks in the cabinet.
Finally I powered up the set. I fed a signal to the set from a ch-1 modulator, and adjusted the controls to get a stable picture. The picture was alright but not great, My picture tube tester said that the control grid (No.1) was open circuit. Odd. the brightness and contrast control worked! Some type of electrostatic coupling? The black to white transitions look as though someone is holding the cathode lead. Low high frequency response.
The tuner's local oscillator seemed to be running a little low. I could not quite tune to sound bars. All the channels that I tried did not quite tune to sound bars.
At this point I decided to give up on this set. Too much wrong.
- Two broken telescopic antennas.
- Bad picture tube.
- Case damaged.
- Tuner alignment.
- Speaker open circuit.
By the way, I have many photographs of the items that I work on, but I do not have much luck uploading them.
If there is someone good at posting photos, I could e-mail some photos to them and let them select which and how many pics to post for each project.
