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during our vast experamentations back in the late 60s and all through the 70s,we found that all 23v and 25 standard tube enterchanged.they would show a picture.the zenith 23v s seemed to be the better of the lot.the 23v inline was very sharp,but had a short life,you are correct.we kept notes on our madness.somewhere i have them.the results of our swaps.this was the most fun i ve ever had.we were the picture tube kings here in columbus,ohio.my personal favorite crt is the sylvania 25vdmp22 with the zenith black matrix a close 2nd.rca made some outstanding crts,also.the best rebuilds were vdc,channelmaster,and empire.i saw a few magnachromes and they looked very good.dont know of their longevity.i would grab that zenith if it were closer
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