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Apr 25, 2017 · I've bought this PTT speaker in second hand shop in Utrecht for 5 Euros back in 2007. Now I've made a small tube amp to fit in, with all metal tubes - 12A6 and 12SC7. It's been my favorite for ... From $20.00 per tube. The fact that the data sheet says "computer tube" means NOTHING! Most tubes used in audio or music amps were originally designed for something else,even used mostly in jet fighters! A "computer tube" usually has a cathode that is specially constructed to resist "poisoning" (a lack of emissions) Never before at this price, 811A/JAN Cetron. Buy these late date Cetron tubes made to the original RCA specifications because Cetron (US company!) bought RCA. Anyway, they are made to run horizontal or vertically. YES, you are correct! This is the exact tube Collins installed in the thousands of 30L-1s they produced for 30 years!