On Thu, 14 Feb 2008, William Donzelli wrote:
"Computer tubes" were NOT developed for
computers. They were developed
for radar applications, mostly IFF.
Wrong, "computer tubes" were developped for computers and
electronic calculating machines. That's why there was the Green Series,
the Red Serien, the Blue Series and the Yellow Series (from Valvo of
course) for commercial tubes. The "ordinary" tubes had only white
paintings (BTW later on, may be in the sixties or seventies Valvo dropped
the color codes). So:
- Blue was for marine/sea applications (e.g. the PL21 thyratron is Blue)
- Yellow was for communications/post ("Weitverkehrsr?hren" like the
E88CC, the 18042 or 18046).
- Green was for computers (e.g. the LGP-30 is full of Green Series tubes
like the E91H, E180CC and E182CC)
- Red was for industrial applications (like the E82CC)
Christian