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Is the C.R.T. a 21ZP4 or a 21YP4? For some reason they used both in or around 56. My "keeper" has the 21ZP4 and all my parts are 21YP4s. I hope someone knows why they did this. The problem that it presents is that you have two identical sets for all practical purposes, but the tubes can't be swapped directly.
The difference from what I have heard and seen is the method of focus, but again the sets are identical. Does anyone have a U.H.F. set?
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"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free"
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