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Yeah many times those dead old tubes can be revived.
I bought a working Majestic radio off the bay awhile back but when I received it the seller had pulled two good 45s and stuffed two duds in the set, someone had even written "DUD" on the glass with a sharpie, but I got the last laugh as I resoldered the filament pins on one 45 and it went from dead to a strong testing globe 45, I've got it in my Atwater Kent 60 now.
The other 45 has a good filament but has no emission so I'll try working on the grid and plate pins.
I also saved a globe 71A with a very loose base and intermittent filament. Now I just can't toss an old tube anymore.
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