I must be thinking of a different model. On May 8, 2016 9:33 PM, "Eric Smith" <[email protected]> wrote:
> On Sun, May 8, 2016 at 9:57 AM, Pete Lancashire <[email protected]> > wrote: > > I thought the Tektronix DAS used a custom tri-color crt, where the > > blue phosphor was replaced with yellow. > > 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). > >
