[Milsurplus] TS-186 & BC-221& LM: How'd they calibrate

[Scott Johnson]

I would imagine the reason Philco used loctals is that  1) they were 
Philco's baby!
2) they have a button seal instead of a press seal, which allows foe 
lower losses and better RF performance, just like a miniature (the 
miniatures were reserved for RF circuits in critical hardware)

Scott

gl4d21a at juno.com wrote:
> That's a very informative article.  I noticed Philco used Loktal 
> tubes in the signal processing circuitry, probably since they were 
> not rationed as octals and miniatures were.  The math is impressive, 
> but that development allowed measurement on the fly.  Wonder how 
> often they had to replace those variable capacitors and rotary 
> switches?  That motor sriven switch hardware looks like something out 
> of the NCR or Bletchley Park codebreakers.
>
> But, it left a question.  The photos show the output being printed on 
> what looks like a narrow paper tape.  Apparently this article was 
> completed before the page printer was added, or did I miss 
> something?  It says pages were printed, but that Frieden carriage 
> looks awfully narrow.
>
> 73,
> George
> W5VPQ
>
>
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