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Information - Help 
ID = 44180
United States of America (USA)
Brand: Bomac Laboratories Inc., Beverly, Mass.
Tube type:  TR-switch 
Identical to 164D = 1B40


Actually the tube in the photos looks to be a 1B40 T/R switch. Either a wrong code or a Bomac proprietary coding system.

Dimensions (WHD)
incl. pins / tip
19 x 34 x mm / 0.75 x 1.34 x inch
164D: F.M.
Fabio Masetti


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