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VAC-M_National

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ID = 56964
       
Country:
United States of America (USA)
Brand: National Electric Specialty Co.; Toledo
Developer: National Electric Specialty Co.; Toledo 
Tube type:  Voltage Limiter, rare gas filled   Text 
  <1925 very rare. ***
Identical to VAC-M_National

Base SPECIAL TUBEBASE in general Other combinations of connections.
Was used by Telephony
Filament
Description

Lightning arrester tube used mainly in telephony. Also used in antenna circuits of radio installations to a limited extent. The three elements are carbon blocks, probably graphite. Each is connected to the base in the following way: 1) to the brass base shell; 2) to a brass ring in the porcelain insulation and 3) to a short female 7 mm threaded tube in the porcelain and concentric with the ring. The actual base style can be traced back to the early 1880's where it was used by the Thomson Houston Electric Company on light bulbs, to not infringe on the Edison Electric Lamp Company's screw base.

 
Dimensions (WHD)
incl. pins / tip
x 130 x 62 mm / x 5.12 x 2.44 inch
Weight 67 g / 2.36 oz
 
20200904_212058.jpg
VAC-M_National: RMG
Robert Gillespie

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