Posts: 1,909
Threads: 216
Joined: May 2015
City: Seattle
State, Province, Country: WA
Nice work Mike!
I'd guess there simply aren't that many K-34 donor speakers out there. According to Ron's speaker spreadsheet the K-34 was used exclusively on the 37-640B:
https://philcoradio.com/library/index.ph.../speakers/
And from the production data in the Gallery there were only 7,000 37-640B _and_ 37-641B (same cabinet) made.
https://philcoradio.com/gallery2/1937a/#Model_37-640B
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