[ARC5] OT - the BC-221-D, tube types.

[Richard Knoppow]

     I've seen and I think have the edition that has the article. 
Electronics can be found at Americanradiohistory.org.  I will see if I 
can find the date but would guess it was late war time when such 
procedures were not so closely guarded.  I've also seen (and may have) 
an article on making your own calibration book if the original is lost. 
This will take some searching because I can't remember where I saw it.

On 12/17/2016 3:35 PM, Jim Haynes wrote:
> As a matter of interest, someone a few years back asked me to look up
> an article in Electronics magazine about how the BC-221 calibration
> books were made in production.  I don't remember all the details, but
> there was a fixture that would motor drive the knobs on a whole row
> of the BC-221s.  And each time the frequency crossed some calibration
> frequency a tick mark was made.  Then they used a machine that was used
> in banking to calculate and print loan payment books, and it would do
> the interpolation between calibration points and print the books.
>
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL