12-08-2023, 11:24 AM
Adding to the comments byPeterScott #14. His strange tube is the RCA 3DP1A, with the central pin in the screen. Intended as a radio compass. I attach the data sheet which shows some of the circuitry.
The comments by David djrm #15 and Jeffrey ppppenguin #16. The 6" CRT VCR97 is the Mullard ECR60 or GEC 1601A previously E4504/B/16 CV960/CV1385, with P1 screen (green medium persistence). Or 1646A previously E4504/M/16, CV966 with P7 screen (blue with long yellow tail). Or 1608 or E4504/E/11, CV1391 with P11 screen (short blue).
The VCR517 appears to be the GEC variant, with five different CV numbers corresponding to the various screen types. CV1591 to CV1595.
The different type numbers adopted to indicate the phosphor was different for each manufacturer, and there were several changes in the 1950s/1960s. By the late 1970s, it had settled down to a single US system (the Pxx), and most European & Mullard/Philips had adopted their common system (eg D13 screensize-47 serial type/ GM phosphor. GEC/MOV continued to use their own system. I attach a summary of the different phosphors and the type numbers used to indicate them.
The WirelessWorld scope of 1963 & 1964 used a 3" tube, either Sylvania-Thorn SE3A (following their own rules) or the Mullard-Philips DH7-78, (using the old Mullard rules). Both nice pda tubes. The later WW 50Mhz Oscilloscope of 1975 uses the D14-47GM (the eventual European- Brimar-Mullard standard).
The makers also frequently added additional numbers/letters to indicate the graticule marking.
3DP1A radial _RCA.pdf (Size: 283.59 KB / Downloads: 6)
CV1591_VCR517A_6.5.pdf (Size: 140.52 KB / Downloads: 2)
ECR60.pdf (Size: 63.8 KB / Downloads: 4)
ECR60.pdf (Size: 63.8 KB / Downloads: 4)
CRT screen phosphors-wm.pdf (Size: 475.46 KB / Downloads: 1)
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wme_bill m0wpn
The comments by David djrm #15 and Jeffrey ppppenguin #16. The 6" CRT VCR97 is the Mullard ECR60 or GEC 1601A previously E4504/B/16 CV960/CV1385, with P1 screen (green medium persistence). Or 1646A previously E4504/M/16, CV966 with P7 screen (blue with long yellow tail). Or 1608 or E4504/E/11, CV1391 with P11 screen (short blue).
The VCR517 appears to be the GEC variant, with five different CV numbers corresponding to the various screen types. CV1591 to CV1595.
The different type numbers adopted to indicate the phosphor was different for each manufacturer, and there were several changes in the 1950s/1960s. By the late 1970s, it had settled down to a single US system (the Pxx), and most European & Mullard/Philips had adopted their common system (eg D13 screensize-47 serial type/ GM phosphor. GEC/MOV continued to use their own system. I attach a summary of the different phosphors and the type numbers used to indicate them.
The WirelessWorld scope of 1963 & 1964 used a 3" tube, either Sylvania-Thorn SE3A (following their own rules) or the Mullard-Philips DH7-78, (using the old Mullard rules). Both nice pda tubes. The later WW 50Mhz Oscilloscope of 1975 uses the D14-47GM (the eventual European- Brimar-Mullard standard).
The makers also frequently added additional numbers/letters to indicate the graticule marking.
3DP1A radial _RCA.pdf (Size: 283.59 KB / Downloads: 6)
CV1591_VCR517A_6.5.pdf (Size: 140.52 KB / Downloads: 2)
ECR60.pdf (Size: 63.8 KB / Downloads: 4)
ECR60.pdf (Size: 63.8 KB / Downloads: 4)
CRT screen phosphors-wm.pdf (Size: 475.46 KB / Downloads: 1)
.wme_bill m0wpn
