Quote:
Originally Posted by Electronic M
Sixty year old mylar caps while usually good aren't infallible. If that tube has a DC blocking cap coupling signal to its grid and the cap went leaky the tube could be biased to conduct too hard and fail (measuring the grid bias and comparing to the schematic will tell you if this is happening).
Tubes that have been subjected to mechanical shock can sometimes just drop dead out of nowhere and that is also a possible explanation.
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Well I replaced the only capacitor that was associated with the EBF89 tube socket and still no dice (the replacement tube is still good, no shorts or anything and I tested the original capacitor and it still tested fine yet.)
Turning the tuning knob in all band modes is still producing a noisy crackly, scratchy noise when tuning across the dial, even though I blew a ton of crap out of the tuning condensers with some compressed air, and I even cleaned it out on top of that with some CRC QD Electronic Cleaner, and still no dice on the noisy tuning.
I tested the rest of the tubes in the radio (an ECH81, an ECC83, an EL84 and an EL86 and an EZ80 tube and the tubes tested fine, no shorts or anything, I even cleaned the band switching buttons with contact cleaner (the same stuff I used on the tuning condenser above) and still not getting anything, no reception, or audio or anything just a hissing noise and the crackling, scratching noise out of the tuner and thats it.
I'm at a loss here for what else to look at on this radio to get it working.
Also I noticed on the ID tag it says that its designed for 50 Cyc. A. C. Rather than 60 Cyc. AC, could that cause some issues with this radio not working correctly?