UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Bush TV 12B To restore or not to restore advice please

bionicmerlin · 10th Feb 2021, 2:10 pm

I have decided to have a go at restoring my TV 12B . Thanks to the encouragement from everyone in my last post back in august.
I decided that I would first build a capacitor reformer . (Paul’s design thanks )Not going for my normal approach and just switch on . So far so good as it’s on now Reforming I hope.
As in my last thread there was a label on the back saying faulty LOPT.
Taking things apart wires cut and it’s been out before . Yes it’s definitely faulty.
I believe it’s the later version With the yellow spot and extra bleed resistors
I don’t know if anyone knows what readings I should be getting but primary is measuring 89K and secondary open circuit.
I only have the manual for the earlier set and it quoted only 92 ohm on the primary .thats a big difference.
I cut the EHT wire off the tube as for fear of pulling the cap off. As the cap fell off the PL38 almost by just looking at it.
I have been over Marks write up a few times.
Any help appreciated but I guess the first thing is to get the LOPT rewound.
Andy

10th Feb 2021, 2:10 pm	#8
bionicmerlin Heptode Join Date: May 2010 Location: Warminster, Wiltshire, UK. Posts: 682	Bush TV 12B again I have decided to have a go at restoring my TV 12B . Thanks to the encouragement from everyone in my last post back in august. I decided that I would first build a capacitor reformer . (Paul’s design thanks )Not going for my normal approach and just switch on . So far so good as it’s on now Reforming I hope. As in my last thread there was a label on the back saying faulty LOPT. Taking things apart wires cut and it’s been out before . Yes it’s definitely faulty. I believe it’s the later version With the yellow spot and extra bleed resistors I don’t know if anyone knows what readings I should be getting but primary is measuring 89K and secondary open circuit. I only have the manual for the earlier set and it quoted only 92 ohm on the primary .thats a big difference. I cut the EHT wire off the tube as for fear of pulling the cap off. As the cap fell off the PL38 almost by just looking at it. I have been over Marks write up a few times. Any help appreciated but I guess the first thing is to get the LOPT rewound. Andy Attached Thumbnails __________________ I bet that car doesn't have a suppressor.