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

Pete Lancashire pete at
Fri May 20 07:27:10 CDT 2016

Actually the CRT was built for Tek. but since is was a custom it can
be though of as a Tek CRT. I'm not sure about the monitory assembly,
sometime this year I maybe able to get the full specs on the CRT if
anyone is interested.

-pete Ex Tekkie

On Thu, May 19, 2016 at 11:18 PM, Eric Smith <spacewar at> wrote:
> On May 8, 2016 9:33 PM, "Eric Smith" <spacewar at> 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 <pete at> 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.

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