Quote:
Originally Posted by N2IXK
Unfortunately, just robbing the gun from a 7JP1 scope tube won't work.
Once the tube is let down to air, the cathode needs to be replaced, because the active oxides become contaminated. If you are going to go through all that trouble, you might as well just rebuild the 7JP4 guns themselves...
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I was NOT trying to say that if the cathode is dead in a 7JP4 to just swap the gun from a 7JP1. I understand that the cathode would need to be rebuilt. Someone earlier insinuated that the guns on 7JP4s were very fragile and may be damaged in shipping despite the rest of the CRT being fine, and I was responding to that by saying that if the gun is damaged beyond rebuild-ability one that could be rebuilt and installed might be obtained from a scope CRT....That and one could potentially make new 7JP4s by rebuilding a 7JP1 and rephosphoring it with P4 phosphor.