Current record mode: basic


560 of 655 records      previous / next

Marconi Radio Valve Type DE6, by Marconi Company, London, c. 1925

Inventory Number: 88794

Date: c. 1925

Maker Details: Signed by Marconi-Osram Valves.

Inscription: "Marconi / Osram / Valve / PATENTED / MADE IN ENGLAND" on one side of exterior surface of bulb. "DEH / 612 / BBC [LOGO] / 951 J" on other side of exterior surface of bulb.

Size: 100 mm in overall length (excluding pins)

Materials: Glass, bakelite, brass?, assorted metals.

Other Given Number(s): Christie's 119.


Marconi-Osram Radio Valve Type DE6, dating from 1925, and suited to the amplification of audio, driven by loud speakers. Construction is classic horizontal co-axial configuration, with a single strand filament at the centre of a bright anode cylinder. The grid is a fine wire helix that stands on and above the support rod, which is fixed at both ends. In silvered glass balloon envelope, with polished bakelite base and four brass? base pins. The BBC logo ("ENTIRELY BRITISH MANUFACTURE") was employed between September 1924 and 1927, and is a good indication of date of origin. Previously catalogued with Marconi Receiver Type 226B (Inv. Num. 40124), Marconi Note Magnifier Type 227B (Inv. Num. 76594), Marconi Long Wave Panel Type 229B (Inv. Num. 41345) and other associated Radio Valves (Inv. Num. 85569).

560 of 655 records      previous / next

Record mode: Basic | Medium Images | Large Images | Documents (1)