Birk-Morton Vacuum Products Co.

Birk-Morton Vacuum Products Company, Owensboro, KY, USA

First seen: 1-Sep-1924
Last seen: 13-Mar-1925

Brand(s): B-M

Advertised for just a few months, the BM-201A was a brass based tipless tube. (it's a stock engraving in the radio news ad) 

Given the references to Birk Morton's proximity to the Ken-Rad tube plant in Owensboro, B-M tubes were likely made by Ken-Rad, and was perhaps their short lived brand.

Birk Morton tubes Sept 1924 ad[1]
BM-201A in Radio News[2]
Birk-Morton BM-201A advertisement[3]

Bibliography references:
  1. Owensboro Messenger (Owensboro,KY), 23-Sep-1924, pg. 9. From Newspapers.com. Retrieved 24-Nov-2018. *
  2. Radio News, Sep-1924, pg. 339. From AmericanRadioHistory.com. Retrieved 19-Oct-2018. *
  3. Radio News, Feb-1925, pg. 1484. From AmericanRadioHistory.com. Retrieved 19-Oct-2018. *

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