Hi Hue:
Does this link answer your question?
https://aafradio.org/docs/TS-164.html
I plan to add some BC-221 info to my Hetrodyne Frequency Standard
web page.
I have found the 1930 Bell Labs patent for the idea:
https://prc68.com/I/USM159.html#History
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
-------- Original Message --------
When was the BC-221 repackaged as the TS-164 ? How
late used then ?
Thanks -
Hue Miller
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