28-07-2016, 08:43 AM
(28-07-2016, 08:41 AM)Old Sparky Wrote: Those are good suggestions, which would be helpful in establishing whether there are other faults, and I wish I'd thought of them before partially dismantling the radio quite a while ago, then putting it on one side. As things are, though, I'd have to reconnect everything and refit the old components I've removed before being able to carry out the tests you suggested, Trevor. Somewhere I have another mains transformer with which I could make up a seperate HT supply, but it would be easier to connect a couple of silicon diodes with limiting resistor, to the exsisting mains transformer and check for other faults. I don't possess a variac, Jeffrey, but could rig up a Lamp Limiter. The phrase 'fools rush in' sums up my approach to this one so far, as I simply decided that, because of it's age, waxed paper caps, out of tolerance resistors, and maybe electrolytics would need replacing before even attempting to power the set up. I did check valve filaments, coils and the mains Tx for continuity, checked the internal wiring, which is entirely solid cored tinned Cu. wire, much of it sleeved, and visually inspect the valves, which is how I realised that the wrong rectifier, a VU39(ZA13088) was fitted. BTW, as of 30 minutes ago, I still haven't had a reply from the radio's owner.
Hi.
As John Wakely would say on another forum "Go on plug it in"
