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Mullard Radio Valve Type CV1052, by Mullard Radio Valve Co. Ltd., Mitcham, 1945 in Box

Inventory Number 28126

Acknowledgement: © History of Science Museum, University of Oxford, inv.28126

Item type
Object
Provenance
Presented by the Marconi Corporation.
Primary inscriptions
"HC / CV1052 / KB/ D" printed on exterior surface of bulb. "VT52 / ZA/ / 11244 A" painted on exterior surface of bulb. "1005.1 / MCA" printed vertically on exterior surface of bulb. Carton has PO / VT181 printed on one end. CV1052 is also written on the same end. "D" indicates manufacturer name, in this case Mullard Radio Valve Co. Ltd., and "HC" is year and month of manufacture, "H" = 1945, "C" = March.
Object type
Radio valve
Dimensions
Diameter: 40mm Height: 110mm Weight: 0.05kg
Inventory No
28126
Accession Number
2004-9/233

Description

Mullard Audio Output Pentode Radio Valve (or Tube) Type CV1052, in plain cardboard carton. UK military service equivalent of EL32 valve (also made by Mullard) with both using the same international octal base. Glass valve with single steel top cap and black plastic? base. With eight steel base pins and one black plastic? central base pin. One steel base pin missing. Lower part of valve blackened, the lower part of the envelope of this valve type is normally silvered or blackened when new since this is the usual "gettering" which maintains a sufficiently good vacuum within the valve throughout its useful life

The manufacturer name and date of manufacture are identified by codes on the bulb: "D" indicates manufacturer name, in this case Mullard Radio Valve Co. Ltd., and "HC" is year and month of manufacture, "H" = 1945, "C" = March.

See http://www.r-type.org/exhib/aaa0303.htm for further details.

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