Quote:
Originally Posted by Tom9589
How are these 6T8s failing? Is the filament burning out? Are certain elements shorting out? Has the emissions gone down to zero? Failure in the triode section or failure in the diode sections or failure everywhere?
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This reminded of an AM/FM Zenith radio I had when I was a kid. I dug it up out of a pile under dad's bench and it worked, so I put it in my room. A month later, it quit. A tube tester showed a dead 19T8 so I put one in that dad had in stock and it ran a month or two and went dead. It wasn't a filament issue, the tube just went dead - low to no emission. I bought one more 19T8 at a parts store and that one lasted a couple of months and quit. I threw the radio out.
Now, I did put a lot of hours on the radio in that two or three months, sometimes leaving it running if I forgot to shut it off during the day and I used to sleep at night with it running on low, so the run time was high.
I don't know if the 19T8 was a lousy short lived design or if something was wrong with the radio, but I didn't know anything about them other than tube swapping at that point.
John