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RCA Radiotron Cunningham Radio Tube Type 5Z3, by RCA, USA, 20th Century

Inventory Number: 56681

Date: 20th Century

Maker Details: Signed by RCA.

Inscription: "RCA Cunningham / Radiotron" etched on base surface. "MADE IN / U.S.A. / 5Z3" printed on exterior surface of bulb.

Size: 140 mm in overall length (wrapping)

Materials: Glass, ribbon, steel, plastic?, assorted metals.

Other Given Number(s): Christie's 216.


RCA Radiotron Rectifier Radio Tube (or Valve) Type 5Z3, in plain umarked cardboard wrapping. Glass tube with black plastic? base and four steel UX4 base pins. Lower part of tube blackened and silvered, probably due to use.

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