Mullard Limited was a British manufacturer of electronic components.
Mullard Radio Valve Co. Ltd. of Southfields, London, was founded
in 1920 by Captain Stanley R. Mullard, who had previously designed
valves for the Admiralty before becoming managing director of the Z
Electric Lamp Co. The company soon moved to Hammersmith, London and
then in 1923 to Balham, London. The head office in later years was
Mullard House at 1-19 Torrington Place, Bloomsbury, now part of
University College London.
1 Partnership with Philips
5 Space science
Mullard brand name
7 Z Electric Lamp Company
8 See also
10 External links
Partnership with Philips
In 1923, in order to meet the technical demands of the newly formed
Mullard formed a partnership with the Dutch manufacturer Philips.
The valves (vacuum tubes) produced in this period were named with the
prefix PM, for Philips-Mullard, beginning with the PM3 and PM4 in
Mullard finally sold all its shares to
Philips in 1927. In 1928
the company introduced the first pentode valve to the British market.
Mullard opened a new manufacturing plant at Mitcham,
Surrey in 1929. A
second building was added in 1936. Both buildings had a very
distinctive flat roof construction and were very similar to those at
Philips' headquarters in Eindhoven, Netherlands. Co-sited with the
Mullard buildings was the manufacturing complex for
Mitcham was also home to the
Mullard Application Laboratory.
In the late 1930s
Mullard opened a new plant in Blackburn, Lancashire.
Mullard had produced a number of television sets, such as the
MTS-521 and MTS-684. In 1951
Mullard was producing the LSD series of
photographic flash tubes.
Mullard had factories in
Southport and Simonstone, near
in Lancashire. The latter closed in 2004. There was also a sister
factory at Belmont in Durham (closed in June 2005). Other
factories included those at
Fleetwood (closed in 1979) and Lytham St.
Annes (closed in 1972). A feeder factory at
Haydock closed in 1981.
Main article: SAA5050
In the early 1980s,
Mullard manufactured the SAA5050, some of the
earliest teletext decoding modules made in the UK.
Mullard owned semiconductor factories in
Southampton and Stockport.
Both sites were owned by
NXP Semiconductors (formerly Philips
Southampton site is now closed. The one in Hazel
Grove, Stockport specializes in power semiconductor devices.
The first transistors produced by
Mullard were the OC50 and OC51
point-contact types, which were not widely used. In 1953
to junction transistors, beginning with the plastic-cased OC10 series.
These were followed by the glass-encapsulated OC44, OC45, OC70, and
OC80 series (the output devices were metal encapsulated to facilitate
heatsinking), which were produced in large numbers and copied by other
companies, such as
Philips subsidiary), Intermetall and
Siemens in Germany, and
Amperex in the USA. RF transistors were the
OC170 and OC171. In 1964 the company produced a prototype electronic
desktop calculator as a technology demonstrator for its transistors
and cold cathode indicator tubes.
In 1957 Philips-
Mullard helped to set up the
Mullard Radio Astronomy
Observatory (MRAO) at the University of Cambridge. In 1966 the Mullard
Space Science Laboratory (MSSL) was opened near Dorking,
part of University College London. The
Royal Society Mullard
Award for young scientists and engineers was set up in 1967.
Mullard brand name
Philips continued to use the brand name "Mullard" in the UK until
Mullard Research Laboratories in Redhill,
Surrey then became
Philips Research Laboratories. As of 2007, the
Mullard brand has been
revived by Sovtek, producing a variant of the
ECC83 and EL34.
Z Electric Lamp Company
The Z Electric Lamp Co. continued business into the 1970s operating
from premises in Thornton Heath, South London, manufacturing lamps of
specialised design. However, it closed due to the recession in the mid
British Valve Association
^ "Mullard". The National Valve Museum. Retrieved 14 January
Mullard & CES". Early
Philips Colour TV. Retrieved 14 January
^ Milner, Mark (2 March 2005). "Union says LG
Philips is to close
Durham factory". The Guardian. Retrieved 14 January 2017.
Philips closure marks end of an era". The Journal. 23 July 2005.
Retrieved 14 January 2017.
^ Woodcock, Ray (January 2006). "And Then There Were None" (PDF).
Philips Electronic Pensioners. Retrieved 14 January 2017.
Mullard Medallists". Royal Society.
London. 2016. Archived from the original on 19 July 2016.
Mullard Award". Royal Society. Archived from the original on 14
Blackburn Vacuum Tubes Factory - YOUTUBE Information Film
Mullard Semiconductors by Andrew Wylie
Mullard History on personal blog