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Description: | 4205D (stamped in tuffnell base). STANDARD TELEPHONES & CABLES LTD. PATENTED IN GREAT BRITAIN 17580/15 161619 180090 (stamped on the nickel plated brass skirt). 2(scratched on the skirt). MANU Standard Telephones & Cables Limited. 1925 North Woolwich, London, England. This valve is part of the Western Electric amplifier GLAHM 113423 which has 4 valves of this type. It is essentially an opened out 'R' type valve. The hot filament is lengthened by zig zagging up and down the centre of the valve. The screen is seperated into two elements comprised of nickel wire grids placed either side of the hot electrode. The nickel sheath is in the form of two plates sandwiching the other elements. All the elements are supported by an offset glass pillar. There is a brass locating pin in the side of the skirt acting as a semi bayonet fitting. The amplifier was used in the Bute Hall public address system. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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