vac tube clock rates / was Re: neon glow lamps (was TTLhomebrew CPUs) in HP counters
cclist at sydex.com
Sun Jul 15 02:06:48 CDT 2007
On 14 Jul 2007 at 23:06, dwight elvey wrote:
> These might have been use for encryption. They used a lot of
> LFSRs in these. That would be mostly flops and little else.
The triodes were attached with clips to anodized aluminum "wings" on
either side of the PCB, with small front panel with a couple of test
points on it. They were also a handy source of silvered mica caps.
Maybe 8-10 inches wide by 3/4 inch tall by 9 inches deep. No
manufacturer's name that I recall.
After over 40 years, that's all I can remember about them. Back
then, I think I paid about a buck apiece for each board. 6.3vac
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