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Zaerix Electronic Valve Type KTW61, by Z & I Aero Services With Carton, London, Mid 20th Century

Inventory Number: 80385

Date: Mid 20th Century

Maker Details: Signed by Z & I Aero Services Ltd.

Inscription: "ZaeriX / Electronic Valve / Z & I Aero Services Ltd. / London. W.2, England" printed on carton exterior. "Valve / KTW 61 / Type" printed on carton lid. "ZaeriX / KTW61" printed on exterior surface of bulb.

Size: 115 mm in overall length (including top cap and base pins)

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

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


Variable Mu Amplifier Pentode Electronic Valve (or Tube) Type KTW61, with green, black and white matching cardboard carton. Glass valve with manufactured blackened upper surface and silvered lower surface. With steel cap, black plastic? base, eight steel base pins and one black plastic? central base pin. Missing one steel base pin.

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