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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