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For O-Scopes, a 5" rectangular Tektronix Instrument CRT type T503RP2 . Large 14 pin type base with 4 external deflection plate pins. Other numbers on tube are 44-1 at the Tektronix emblem and the numbers 268 3526505 P2 299 17 on the bottom of tube near the face. The number 503R-11865 and 44-1 at deflection pins. No Burns on face with good getter flashing and a good |