6 Jun
2018
6 Jun
'18
1:37 p.m.
On Jun 6, 2018, at 3:40 PM, Chuck Guzis via cctalk
<cctalk at classiccmp.org> wrote:
One of the more interesting things about the DD60 display was the use of
2C43 "Lighthouse" UHF triode tubes to drive the CRT electrostatic
deflection.
UHF, yes, but not those. The final state uses 3CX100A5 UHF transmitter tubes. The 2C43
would not appreciate the 2000 volt plate voltage used in that stage. The driver stages
are fairly ordinary looking receiver style dual-triode tubes.
Only being around briefly for the 170 system, I
don't know how the
magnetic deflection was driven there.
I imagine that the cost of the DD60 was due in no small port by the use
of the CRTs--I believe they were produced in Germany.
Really? It is shown as a K2263-P31, manufacturer Fairchild Camera and Instrument
Corporation, Defense Products Div., Clifton NJ. I sure would like to get my hands on
specs for that tube.
In any case, they were sometimes referred to as "radar tubes" which sounds
somewhat reasonable. Certainly very different from TV CRTs, and bigger than what's
used in oscilloscopes, so they were most likely low volume which would explain a high
price.
paul