RSGB
CV Equivalents Information

VALVE, TUBE AND DEVICE MANUFACTURERS

AEI         Thorn-AEI Radio Valves and Tubes Ltd.,
            7 Soho Square, London, W.C.2.

AEI-BTH     AEI (Rugby) Ltd.,
            Rugby, Warwickshire.

Am.         American Manufacture.

BEL         Thorn-AEI Radio Valves and Tubes Ltd.,
            Brimar Commercial Division, 7 Soho Square, London, W.C.2.

Cm.         Cinema-Television Ltd.,
            Worstey Bridge Road, Lower Sydenham, London, S.E.26.

Cos.        Cossor Valve Co. Ltd.,
            The Pinnacles,
            Harlow, Essex.

EEV.        English Electric Valve Co. Ltd.,
            Waterhouse Lane,
            Chelmsford, Essex.

EMI         EMI Electronics Ltd.,
            Valve Division,
            Ruislip, Middlesex.

Erics.      Ericsson Telephones Ltd.,
            Tube Technical Services Dept.,
            Beeston, Nottingham.

ETL.        Electronic Tubes Ltd.,
            Suffolk Works, 313 London Road,
            High Wycombe, Bucks. (ref. to Mullard).

Fer.        Ferranti Ltd.,
            Electronics Dept., Hollinwood, Lancs.

GEC         Associated Semiconductor Manufacturers Ltd.,
            Mullard House, Torrington Place, London, W.C.l.

Hiv.        Hivac Ltd.,
            Stonefleld Way, Victoria Road, Ruislip, Middlesex.

MOV.        M-O Valve Co. Ltd.,
            Brook Green Works, Hammersmith, London, W.6.

Mul.        Mullard Ltd.,
            Mullard House, Torrington Place, London, W.C.l.

Plessey     Semiconductors Ltd.,
            Cheney Manor, Swindon, Wiltshire.

Pye         Newmarket Transistor Co. Ltd.,
            Exning Road, Newmarket, Suffolk.

STC         Standard Telephones & Cables Ltd.,
            Brixham Road, Paignton, Devon

Tung.       British Tungsram Radio Works Ltd.,
            West Road, London, IN.17.

Tex.        Texas Instruments Ltd.,
            Manton Road, Bedford,


VALVE, TUBE AND DEVICE CODING SYSTEM
         
In order to assist in identifying a particular valve, tube or device, a 
coding system has been used which provides information on its structure 
or function. The coding system consists of a letter or a group of 
letters, e.g. T - Triode, DDT - Double Diode Triode, R - Half-wave 
Rectifier, RR - Full-wave Rectifier. Semiconductor devices are given 
titles as follows: SD - Diode, ST - Transistor, SZ - Zener diode, 
SZ Rf - Zener Reference diode, etc. 

Details of the coding system are given below:-

         B      Barretter
         C      Counter Tube
         CC     Cold Cathode Valve
         CR     Cathode Ray Tube
         D      Diode
         GM     G-M Tube
         H      Heptode
         L      Lamp
         LI     Letter or Number Indicator
         LZ     Lighting Arrester
         ND     Noise Diode
         NI     Neon Indicator
         O      Octode
         P      Pentode
         PC     Photo-cell
         PM     Photo-multiplier
         Q      Tetrode
         R      Rectifier
         Rf     Reference
         Rg     Regulator
         S      Strobotron
         SD     Crystal Diode
         SDN    Tunnel Diode
         SP     Transistor Photo Cell
         SR     Power Rectifier Diode
         ST     Transistor
         SVC    Variable Capacitance Diode
         Sw     Switch
         SZ     Zener Diode
         T      Triode
         Th     Thyratron
         TI     Tuning Indicator
         TS     Thermal Delay Switch
         TW     Travelling Wave Tube
         VI     Voltage Indicator
         VM     Velocity Modulated Valve
         VS     Gas filled Stabilizer
         X      Hexode

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