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ID = 34280
Brand: Research Enterprises Ltd., Toronto
Tube type:  TR-switch 
Identical to REL21 = 10E/467 = CV1507 = VI507C = 21_REL
Similar Tubes
Normally replaceable-slightly different:
  CV86 ; VI507

Base Wires
Was used by Radar

Argon-mercury atmosphere spark-gap. Glass body; one electrode pin out from each end; side sealing tip. Production run by Rogers for Canadian REL.

Used as TR antenna switch in the BC-1188A, part of SCR-636A of the CHL system manufactured by REL for the surveillance of Panama Channel. Fully interchangeable with 10E/467 used by British  in their CHL radar sets. Also used from mid 1942 in Admiralty Type 291 commercial shipboard warning set.

Dimensions (WHD)
incl. pins / tip
x 47 x 19 mm / x 1.85 x 0.75 inch
Information source Tube Lore (I)   
REL21: R.O.
Rudolf Osterkamp

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REL21: Manufacturer's Literature
Emilio Ciardiello

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