On May 8, 2016 9:33 PM, "Eric Smith" <space...@gmail.com> wrote about the CRT of the color monitor of some models of the Tektronix DAS 9100 logic analyzer: > It is custom, and it is tri-color (red, green, yellow), but it's a > beam penetration CRT that is not a modified version of any normal > color CRT. There is no shadow mask, and it can only draw one color per > field, like the 1951 CBS field-sequential color television, though > that was done with a color wheel while this is done by modulating the > anode voltage (and possibly the deflection drive as well).
On Mon, May 9, 2016 at 7:45 AM, Pete Lancashire <p...@petelancashire.com> wrote: > I must be thinking of a different model. Now that I've looked at volume 1 of the DAS 9100 service manual, I believe my information was incorrect. Volume 1 is scant on details of the color monitor, but it does say that the anode voltage is 21kV. If it was a beam-penetration CRT, it would have to be switched between different voltages for red and green. (And yellow, if that was generated with its own phosphor layer rather than as two passes with red and green.) The color monitor is manufactured by Tektronix using a CRT also manufactured by Tektronix. The monochrome version uses a monitor OEM'd from Motorola.