Just like Tek, Hp
did make their own CRTs, after the early
scopes like the 120 and related units, where standard jedec numbers
were used (5ADP1, 5AQP1, etc.). Nobody was happy buying tubes from
Dumont, however, too much competitive friction, and that meant
learning to make tubes from scratch.
The hp internal designs eventually were quite advanced, and they
sometimes used a clever technique called a flood gun to light up the
phosphor, making the black graticule stand out.? Tek side lit the
actual graticule with lamps to get it to be visible, two very
different optical techniques. They (hp) had some very fast CRTs, as
well as fast storage tubes, to at least 275Mhz. I do not know where
the hp? CRT plant was located, or when they stopped production.
The magnetic raster scan tubes used later (digital scopes and logic
analyzers) were japanese imports, basically TV tubes, and some color
systems used a turn-key CRT/video display bock from Sony.
I am still trying to find actual specs on the 5083-series tubes, but
so far, that has proved elusive. I do keep an index of tubes and
units on our site I made up from actual systems and manuals, you can
see it here:
all the best,
walter
--
Walter Shawlee 2
Sphere Research Corp. 3394 Sunnyside Rd.
West Kelowna, BC, V1Z 2V4 CANADA
Phone: +1 (250-769-1834 -:-
+We're all in one boat, no matter how it looks to you. (WS2)
+All you need is love. (John Lennon)
+But, that doesn't mean other things don't come in handy. (WS2)
+Nature is trying very hard to make us succeed, but nature does not depend on us.
We are not the only experiment. (R. Buckminster Fuller)
