Quote:
Originally Posted by Joe Ingle
it worked well for a minute, then there was some crackling accompanied by the lamp dimming. I suspected one of the windings on the TX might be about to give out, so I shut down.
I then tried removing and replacing the rectifier in its socket, powered up again and it was fine. I ran the radio for about 4 hours this morning direct to mains with no funny noises or smells, so fingers crossed it's all OK.
|
This sort of suggests to me that there might be a problem with the valve holder...possibly one of the pins not making proper contact. have a careful look and see if any of them are broken or maybe just need clenching together (carefully).
I would have thought that if the transformer was breaking down, more likely the lamp would have brightened rather than dimmed. Of course windings can go open circuit which would probably cause dimming whereas shorted turns would cause the lamp to brighten. Shorted turns are unlikley to 'right' themselves but perhaps an O/C winding might correct itself particularly if the windings are terminated with solder tags and there was a dry joint at the terminal.
I would carefully check the valve holder first and then check connections at the transformer itself.