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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). V (scratched on the skirt). No. 15019 (printed on the box). VALVE for BUTE HALL AMPLIFIER (written on end of box in black ink). MANU Standard Telephones & Cables Limited. circa 1925 North Woolwich, London, England. This valve is from a Western Electric amplifier which has 4 valves of this type. One of the original valves numbered 1-4 has been replaced and this valve is one of the three remaining of the original set of six spare valves. It is essentially an opened out 'R' type valve. The hot filament is lengthened by zig zagging up and down the center 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. The original packing in the form of a cardboard box is in a box on top of SCI:1. | 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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