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What support (e.g., documents) do we have for the sentence, "531s with below S/N 7950 have DuMont 5BGP2 instead of Tektronix T533P2." Did 531s ever ship with DuMont CRTs in them? I can't find any evidence of this. 07:02, 31 May 2020 (PDT)

I removed the sentence about the DuMont CRT. Kurt (talk) 07:25, 17 June 2020 (PDT)

While waiting for a particularly long OCR to finish (I must get a scanner configured - phone resolution was too much), I had a dig around and found a ref to the idea of a DuMont in the 531 but not the exact serials.

See: [1]

The 513 was first introduced with the 5XP CRT from DuMont was replaced after SN 1887 with the first Tektronix made CRT, the T51. This is the same CRT used in the Type 531 and 535 oscilloscopes. Unlike the DuMont CRT that used four discrete increasing acceleration voltages (and four separate anode buttons), the T51 employed a pioneering resistive helical anode connection that gradually increased the acceleration potential and avoided the deflection distortion caused by the abrupt high voltage changes found in the DuMont CRT. More information on the T51 can be found on the Tektronix CRT History page in Part 2.

Qfissler (talk) 11:52, 13 July 2023 (PDT)