Beam-penetration color CRT, Tektronix DAS 912x (was Re: Nice LAB11 brochure.)

[Pete Lancashire]

I must be thinking of a different  model.
On May 8, 2016 9:33 PM, "Eric Smith" <spacewar at gmail.com> wrote:

> On Sun, May 8, 2016 at 9:57 AM, Pete Lancashire <pete at petelancashire.com>
> 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).
>
>