How do you do that Jez? Would you set up a voltage divider with high value resistors so that the voltage equalised? Would the resultant current bleed through the VD be tolerated? I suppose that it would for smoothing caps, it's not going on through anything else.It may be that when two caps have apparently been used in series to get the voltage rating required it has been done without taking precautions to make sure they share the voltage fairly equally.
How do you do that Jez? Would you set up a voltage divider with high value resistors so that the voltage equalised? Would the resultant current bleed through the VD be tolerated? I suppose that it would for smoothing caps, it's not going on through anything else.
Bloody hell, good to know that I haven't forgotten everything I learned. So you select resistors to give say a few tens of mA through the VD and let physics sort the rest.Yes to all Steve
Other than NOS valves with added fairy dust, possibly.there are no foo components in vintage hifi
Right, I've just spoken to Nicholas Besley at Emporium, he wants to have a go at repairing the amp and I've decided to give him the chance. He says he has staff who can do it.
If you post or PM me a picture of the amp with the bottom cover removed and the top cover removed (a pic from below and one from above) I can probably diagnose the issue by sight alone if it's obvious what has smoked up. Might be a good idea before the amp goes anywhere!
Bloody hell, good to know that I haven't forgotten everything I learned. So you select resistors to give say a few tens of mA through the VD and let physics sort the rest.
As regards this Radford, I have a Yaqin MC 10, with 2x EL34 a channel, is it a shared or similar circuit? Sounds very good, either way.
If you post or PM me a picture of the amp with the bottom cover removed and the top cover removed (a pic from below and one from above) I can probably diagnose the issue by sight alone if it's obvious what has smoked up. Might be a good idea before the amp goes anywhere!
As the STA 25 ran for 6 hours, that to me says bias capacitor failure, a simple diagnostic and repair job.
If the PSU reservoir capacitor/s failed, that would have taken minutes to fail, and possibly take out the mains transformer.
The mains fuse should have blown before a catastrophe!
Very unlikely indeed! PSU reservoir caps most likely. If the OP posts the pictures here I will have a look also...