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Basically what Chad is saying by Delta is that older tubes were called delta because they have three guns in the picture tube to create beams for color. They are arranged in a triangular pattern therefore being named Delta. One for blue, red and green. The newer tubes are inline tubes which means the three beams are created inside one gun or housing. I agree with Chad that the Admiral branded tubes werent much and never really produced the best picture that the rest of the set can be capable of. Zeniths seem to be the most rugged and as long as they have good emission will produce a fantastic picture. RCA tubes and others will work too but might not give you as good of a picture or reliability. Most color tubes that are more rounded on the corners like the 25X or AP22 or similar and the later 23V**P22 (23 inch viewing area) tubes will work in your Admiral. The later 70's and early 80's Delta color tubes (example RCA XL 100 and early Colortrak or later Zenith Chromacolor 3's and System 3's) wont work as they are slightly larger and more square on the corners so wont mount in your Admiral and with the more square tubes its hit and miss whether its a delta or inline tube. Their still to be had its just you have to keep an eye out for a set that uses one or somebody local to you might stumble across a parts set with a good crt. I got a low hour black matrix tube off of Ebay not too long ago for $95 shipped. I've done business with the seller in the past so knew he packed well so i wasnt worried about it getting shattered in shipment. They pop up on there once in awhile and the guys on here usually let us know when they do so you have options, it just takes time. Good Luck.
-Tony
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