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CV marked valves
CV stands for Common Valve. Valves used by the British Services were marked with CV numbers. In addition a number of valves used by the GPO were CV types. CV numbers have been around since the early 1940's - CV1 was listed in the "Service List of Valves for Special Purposes" published by the Inter-Service Technical Valve Committee in 1941, though at that time their own Service List of Preferred Valves does not appear to have had any CV valves in. Certainly they were in use in 1942 as the specification sheet for the CV44 is dated 9/4/42, and also the type approval date of CV8 is given as 1942.
There is no defined sequence of numbers, though groupings are apparent, e.g. CV4xxx are 'reliable' types. In fact some early valves were given 'later' numbers.
See also: The online CV lookup database and the online 1963 CV Register
CV codes
The codes marked on a valve are made up as follows:
(a) The CV number
(b) The broad arrow (Government mark)
(c) The date code
(d) The letter K for a valve made to specification K1001 or K1006
or
J for a valve made to the JAN or MIL specification
(e) The qualification approval letter as follows:
B when approval has been given by a UK authority
U when approval has been given by or on behalf of both UK and US authorities
D when approval has been given by the Australian Services
Note: when approval has been given for the use of a valve in MDAP equipment by the Director of Electronics Research and Development (Air) but that valve has not received qualification approval the letter X is used.
(f) Factory identification code
(g) Any other marking required by the test specification.
Items (d), (e) and (f) are arranged in that order with an oblique stroke between (e) and (f).
When a serial number is required it is sometimes put on an internal component provided it is clearly visible.
When the test specification requires an EIA or RETMA or other US type designation and a mineral filled base is used the letter Y is appended to the name to indicate this, e.g. CV509 - 6V6GY
Date codes
The date code is made up in one of two ways. A 4 digit code is made up of the last two digits of the year followed by the number of the week in the year starting at 01. Note that week 1 is defined as the week in which January 1st falls on or between Sunday and Friday. If it falls on a Saturday, week 1 starts on the 2nd January. Thus 6407 means the 7th week of 1964.
Alternatively two letters were used. This was allowed up to January 1st 1965. In this scheme the first letter A = 1945 and so on, and the second letter A=January and so on. Letters I and O were not used. Thus AA = January 1945, NF = June 1957.
If it was not possible to put all the above information on a valve, for example due to size, permission could be granted for the omission of some. The order of preferred retention is:
1) CV number
2) Factory code
3) Date code
4) Broad arrow
5) Specification and qualification letters
Where valves with allocated CV numbers are accepted to a commercial specification in the absence of a CV test specification these may only carry the CV number and the broad arrow.
If a valve which has not met some particular physical or electrical requirement is still accepted the letters to the left of the oblique stroke should be replaced or cancelled by a yellow splash.
If a valve is required before qualification approval has been given or has been withdrawn the letters to the left of the oblique stroke should be omitted or cancelled with a black, dark or neutral splash or stroke.
Warning marking for radioactive valves
All British manufactured radioactive valves should carry the word CAUTION and the standard three-bladed radioactive symbol with the chemical symbol(s) for the radioactive element(s) indicated, for example Co 60 for Cobalt 60.
The previous marking was an orange band 1/4" wide.
See also Radioactive valves
Reference:
The above information is detailled in Joint Service Specification K1001 section 4.
See sheets K1001-4-1, K1001-4-2, K1001-4-3 and K1001-4-4
Manufacturer's factory identification codes
These show where the pumping process was completed.
Code Manufacturer
A Mullard, Blackburn, prior to Jan 1951
A Thorn, Tottenham, prior to April 1964
AB Sylvania-Thorn, Enfield
AC Thorn-AEI, Footscray
AD Thorn-AEI (Brimar), Rochester
B Edison Swan, Baldock, prior to Sept 1945
BA AEI, Woolwich
BC Joseph Lucas, Birmingham
C Edison Swan, Ponders End, prior to Sept 1951
CC Cathodeon, Cambridge
CE 20th Century Electronics, prior to March 1957
CF 20th Century Electronics, New Addington
CN Pye Industrial Electronics
CO Newmarket transistors, Newmarket
CS Cathodeon, Southend
D Mullard Radio Valve Co., Mitcham
DA Mullard Radio Valve Co., Blackburn
DB Mullard Radio Valve Co., Salford
DC Mullard Radio Valve Co., Whyteleafe
DE Mullard Radio Valve Co., Fleetwood
DF Mullard Radio Valve Co., Waddon
DG Associated Semiconductor Manufacturers, Southampton
DH Societe Anonyme Philips, Brive, France
E Thorn-AEI, Brimsdown
EA Edison Swan, Ponders End
EB Edison Swan, Gateshead
EC Edison Swan, Tottenham
EN Thorn-AEI, Sunderland
F STC, Paignton
FB STC, Footscray
FC STC, Lorenz,. Esslingen, Germany
FD STC, Rochester
FDA Alexandria, NSW, Australia
FE STC, Oldway (Additional to Paignton factory 'F')
FF STC, Harlow
G Ericsson, Beeston
GA (Ericsson), AB Svenska Elektronror, Stockholm, Sweden
H Hivac, Harrow
HC Hivac, Chesham
HR Hivac, Ruislip
J STC, Crewkerne, prior to Jan 1946
J Radar Electronic Equipment
JA SGS Fairchild, Ruislip
JB SGS Fairchild, Agrate, Milan, Italy
JD Elliott Bros. (London) Ltd, Borehamwood
JE Elliott-Litton, Borehamwood
JK La Radio Technique, Suresne, Paris, France
JN International Rectifier Co., (GB) Ltd, Oxted
JQ Associated transistors, Ruislip
JT Microwave Associates Ltd, Luton
K Electronic Tubes, High Wycombe
L CSF, Levallois-Perret (Seine), Paris, France
L MOV prior to Oct 1951
LB CSF, St. Egreve, Grenoble, Isere, France
M Gramophone Co., Hayes
MA EMI research labs, Hayes
MB EMI research labs, Ruislip
ME EMI, Hayes
MR EMI (Valve Division), Ruislip
MT EMI, Treorchy
N Nore Electric, Southend
N STC, Footscray, prior to August 1951
NP Texas Instruments, Dallas Road, Bedford
NQ Texas Instuments, Bedford
NR Texas Instruments, Nice, France
O Rank Cintel, Lower Sydenham
OR Rank Cintel, Rotunda
OS Rank Cintel, Sidcup
P Philips, Eindhoven, Holland
P GEC, Shaw, prior to August 1948
PA Philips Teleindustri, Stockholm, Sweden
PDA Philips, Hendon, Australia
Q English Electric Valve Co., Chelmsford
QB Marconi Wireless Telegraphy Co., Great Baddow
QC Marconi Wireless Telegraphy Co., Chelmsford
QD English Electric Valve Co., Stafford
QE English Electric Valve Co., Kidsgrove
QF English Electric Valve Co., Nelson Research Labs, Hixon
R Ferranti, Moston
R Ferranti, Gem Mill, prior to July 1947
RA Ferranti, Edinburgh
RB Ferranti, Dundee
RC Ferranti, Chadderton, Oldham
S AEI, Rugby
SA AEI, Lutterworth
SB AEI, Lincoln
SC CFTH, Usine de Joinville, Seine, france
SD SESCO, Rue de L'Amiral, Mouchez, Paris, France
SDA Amalgamated Wireless, Australia
SF CFTH, Rue Mario-Nikis, Paris, France
SL AEI, Leicester
SP AEI, Peterborough
T British Tungsram, Tottenham
U MOV, Bulmer, prior to Oct 1945
U Nucleonic and Radiological, Stratford
V Cossor, Highbury, prior to Sept 1945
V Gilbert Photoelectrics
VA Westinghouse, Chippenham
VF MCP Electronics, Alperton
VL Hughes Internations (UK) Ltd., Glenrothes
VR Brucsh Crystal Co., Hythe
W GEC, Hirst Labs, Wembley
ASM Ltd
WB GEC, Coventry
WD Claude General Neon Lights, Wembley
WE ASM Ltd, Hazel Grove
WF ASM Ltd, Broadstone
X MOV, Springvale, prior to Oct 1951
Y MOV, Moray, prior to April 1945
YA Leigh Electronics, Havant
YC Semiconductors Ltd., Cheney Manor, Swindon
YD Semiconductors Ltd., Towcester
Z MO Valve Company, Hammersmith
ZA MOV, Gateshead, prior to March 1957
ZB MOV, Perivale
ZC MOV, Springvale, prior to August 1957
ZD MOV, Dover, prior to Dec 1956
ZE Osram GEC Lamp Works, MXT Dept, prior to March 1957
References:
The above data can be found in:
Joint Service Specification K1001 (cover)
This file was last modified 11:07:04, Thursday September 22, 2005
