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I have a KM 60 that has worked perfectly for years. Last week it blew the main fuse. I replaced it and now still no lights/power. Is the large can capacitor next to the transformer a part of the power supply? If it failed would there be any visible signs of the failure? I haven't removed the bottom cover and looked, yet I'm OK with a soldering iron. A few months ago the 6DJ8 needed to be replaced. Any thoughts or advice would be appreciated.
Follow Ups:
That one uses a selenium rectifier full wave bridge.
Shown on the schematic as SR. They are known to go bad whan old, and usually smell bad on the way out. You can replace a SR with normal 1200V rated silicon diodes, but they will have significantly less voltage drop. To match the old B+ voltage you can insert a power resistor in series after the diodes.
That's a great tuner, mostly a kit version of the FM100B with different metering. I like the KM-60 horizontal tube for tuning, like certain Sherwood S3000 models meters...
as fredtr said-
Electrolytic capacitors are the most likely to fail, and for a KM-60, that is a highly likely proposition!
you could also leave it in place, disconnect it and put the new caps as you find space-
usually the large cans were multi-caps with 3-5 lugs and 2-4 elements (caps) so a little homework to figure it out...
Happy Listening
Sure, take off bottom panel and look around. Large capacitor, yes part of power supply, if electrolytics haven't been replaced they should be. Check the diodes with an ohm meter.
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