Catalogue
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Siemens & Halske Experimental Radio Valve, by Siemens & Halske, Germany, c. 1917
Inventory Number: 50748
Date: c. 1917
Maker Details: Signed by Siemens & Halske.
Inscription: "Siemens & Halske A.-G. Wernerwerk / Verstarker Nr. 19558 / In Betrieb / aus Betrieb / Gosamtbrennstunden / Unterschrift / Siebe Ruckseite" printed on yellow cloth maker's label attached to base.
Size: 110 mm in overall length (including end caps)
Materials: Glass, bakelite?, steel, assorted metals.
Other Given Number(s): Christie's 213, 146 (white tag).
Notes:
Siemens & Halske Experimental Triode Radio Valve (or Tube) with large vertical glass tube, sliding contacts at each end, two bakelite? base end caps and four unusual steel terminals (two on each end). Previously catalogued with assorted other valves.
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