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UPDATE: I retested the pix tube on this TV and sure enough all three color guns tested in the Bad range on the tester and the cut-off test was around 250V til I got to the cut-off mark which I'm guessing means a bad pix tube?
Also I have the numbers off the pix tubes inside both of my Sylvania TVs (the one from 1974 and this one that this thread is about), The Pix Tube inside my 1967 Sylvania TV is a 25AJP22, and the one in my 1974 Sylvania GT Matic is a 25VDMP22 which my tube tester does not have listed in the setup chart for my Pix Tube tester which is a B & K Model 465 CRT Tester from 1966 according to the manual. I'm wondering if these tubes can swap out for each other? If so would there be any sort of modification I would need to do? the first and last 2 digits are the same (they are both 25" tubes and they are both 6.3V heaters, its just the middle 3 and 4 letters I'm not sure about, and why one picture tube has 3 letters in the middle and the other has 4 letters in the middle of the first and last 2 numbers.)
Any help would be appreciated.
P. S. I'm wondering when the 25VDMP22 tube would of came out because I have a tube substitution manual from 1971 and it doesn't list the 25VDMP22 picture tube in the manual but it does list the 25AJP22 tube in there and a list of 4 tubes that would sub out for it.
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