I'm not sure who turned me on to this (may have been a fellow inmate, so apologies if I'm being remiss in offering due credit), but it's a nifty Windows based program that makes tube substitution info and pinouts a breeze. I know of several sites on the internet that offer similar information, but once you have this loaded, you don't have to log on and / or wait for (sometimes) very slow connections to put a damper on your thirst for knowledge.BillC
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