Quote:
Originally Posted by radiotvnut
OK, I now have a usable 12LP4 CRT in my possession. A member of the ARF had a late '50's Dumont tube that was weak but usable. When I first connected it to my tester, (B&K 480) it checked in the red (which I expected). I wasn't really worried because I've seen B&W tubes check bad and actually still make a watchable picture. After about 30 minutes on the tester, the tube checked in the green. It's now been on the tester for 1.5 hours and I'm about to go check it again. This tube probably just needs to be used.
Now, would there be any need for me to save the dud 12LP4? The only reason I would suspect that I need to save it would be to have it rebuilt; but, I'm open to suggestions.
I'm probably not going to install the new tube until I'm done recapping the chassis.
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I would save the dud 12LP4. Even if you don't plan on getting it rebuilt, someone else may want it for that purpose. I haven't seen any show up on the bay for some time.
According to Scotty the guns are getting scarce also. He keeps the old guns in case he needs to get them rebuilt.
The 12LP4 in the Philco I haven't started to work on yet behaved like your replacement. It looked completely dead. Then a couple of sudden jumps and the emission started to climb to a decent level and the G1 cutoff was acceptable. As near as I can tell it had been just sitting unused for 29 years.
John