[R-1051] +4 volts

[David Wise]

Thanks for the data point, Ray.  I guess it may be so, but
the 500cps flip-flops used +10.  Why not stick with that?
(And for what it's worth, the hundreds and hundreds of FFs
in the IBM 1620 Data Processing System - ca. 1960 - ran on 12V.)

Dave Wise

>-----Original Message-----
>From: r-1051-bounces at mailman.qth.net 
>[mailto:r-1051-bounces at mailman.qth.net] On Behalf Of Ray Fantini
>Sent: Tuesday, September 04, 2012 11:23 AM
>To: R-1051 Discussion Group
>Subject: [R-1051] +4 volts
>
>+4 volts, and +3 were a common voltage to use when building 
>early transistor divider (MMV) chains. Years ago I worked on 
>lots of television timing equipment built by a company called 
>Riker Video that's was an early adapter of transistor 
>technology and those dam things were loaded with germanium 
>divide by two , three and ten circuits and the whole mess was 
>powered by +4 volts.  Think low voltage was standard for 
>building logic circuits before the integrated circuits.
>When I started in electronics TTL and CMOS were king, LSI was 
>just starting, except for a short period of time working on 
>the Riker junk have little or no experience with the earlier 
>DTL or RTL stuff. Looking at a lot of the early guidance and 
>INS navigation stuff there was a lot of earlier integrated 
>devices out there, what happened to all that stuff? The later 
>1051 and URC/URT are about the only examples you can find of 
>mid to late sixties technology.
>Ray F