[dazzlevision]

Here is my research into the companies mentioned above:

Balun Ltd, Crawley Road, Horsham, Sussex. Tel. Horsham 3232/3 (in 1957). Maker of wideband transformers. By 1961, associated with Hatfield Instruments Ltd, Burrington Way, Plymouth, Devon.

Hatfield Instruments Ltd, 175 Uxbridge Road, Hanwell, London, W7 (in 1953). In 1964 & 70, Burrington Way, Plymouth, Devon. Originally a seller of refurbished test equipment. In 1953, they made a VHF Tx output meter and in 1970 baluns, hybrid transformers, multicouplers and radio transceivers. In 1967, they also made high frequency ac power supplies. In 1964, they distributed a field strength meter made by Prestel SRL of Milan, Italy. Taken over by Wandel & Golterman – by 1982 and renamed W&G Instruments Ltd, Plymouth.


Wandel & Golterman (UK) Ltd, 40-48 Acton High Street, London, W3 (in 1970-4). German maker of mainly telecoms type test equipment, established in 1923 by Wolfram Wandel and Ulrich Goltermann, when they made radio receivers. Wandel und Golterman GmbH, Eningen u Achalm, Germany. W&G took over Hatfield Instruments, of Plymouth. W&G merged with Wavetek in the 1998. Following a further merger in 2000, with TTC, the company was renamed as Acterna. In 2005, Acterna was acquired by US company JDSU (JDS Uniphase Coproration). In 2015, JDSU split into two separate companies: Viavi Solutions and Lumentum Holdings Inc.