14-03-2022, 07:51 PM
I have spent the past few days working on the A26. I finally got around to de-packing the capacitor block and using modern caps within it. Replaced a few wires were the insulation was crumbling away and also managed to replace the wax paper capacitors, every one I tested was showing a very high ESR and % loss as well as being way over value on my simple TC1.
many of the waxes have been re-packed with modern ones, awaiting a trip to Golborne so get a few values I am out of such as a 0.047uF so I can replace the last one in it's tube, for now it has a 68nF mustard cap in it's place.
You can see very easily one wire I replaced, but the other 5 which are black, not so much. I did wonder why much of the wiring is done in what I guess is double cotton covered and some was in rubber?
The two valves have also been sprayed with Graphit 33 and tomorrow will be fitted. I have done a few tests with an insulation tester with reasonable results on the mains transformer. New mains lead fitted and have taken the chassis to mains earth in the lead.
Still do not have a mains variac, so will see if I can blow the fuse or not tomorrow!
Adrian
many of the waxes have been re-packed with modern ones, awaiting a trip to Golborne so get a few values I am out of such as a 0.047uF so I can replace the last one in it's tube, for now it has a 68nF mustard cap in it's place.
You can see very easily one wire I replaced, but the other 5 which are black, not so much. I did wonder why much of the wiring is done in what I guess is double cotton covered and some was in rubber?
The two valves have also been sprayed with Graphit 33 and tomorrow will be fitted. I have done a few tests with an insulation tester with reasonable results on the mains transformer. New mains lead fitted and have taken the chassis to mains earth in the lead.
Still do not have a mains variac, so will see if I can blow the fuse or not tomorrow!
Adrian
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve
