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Posted by STEVE M on


The Welwyn wire wound precision resistors that I offer are in the category of "once they're gone, they're gone" as they started life as a finite supply at the GPO Dollis Hill laboratory before ending up with me.

Anyone know anything about Welwyn? Well, for those that don't, here's a potted history.

Welwyn Electrical Laboratories Ltd was established in 1937 in Welwyn Garden City, near London, UK. Many of the earliest products were vitreous enamelled wirewound resistors which developed over the years into the well-known green W20 series, together with cracked carbon film resistors.

The company relocated to the North East of Britain at Bedlington and as this 1960 photo shows, it was an impressive site even then:-

Here the innovation continued with the development of an award winning tin oxide process, thick film and thin film processes, and in the 1990s, thick film on steel power resistors. But wirewound technology always remained important for Welwyn, and many process developments enabled higher ohmic values, higher surge energies and tailored fusing performance to be achieved.

In 1990, Welwyn Electrical Laboratories Ltd became part of the TT group which itself originally was Tyzack Turner, incorporated in 1888 and virtually 100 years later to the day, changed its name to TT group and thence to TT Electronics plc in 2000. 

TT Electronics Plc is a global manufacturer of electronic components and provider of manufacturing service which engineers and manufactures sensors, power modules, resistors, magnetics, semiconductors, connectors and optoelectronics for the industrial, aerospace and defence, medical and transportation markets.employing approximately 4100 staff across 21 locations worldwide. Current product brands are AB Connectors, Aero Stanrew, BI Technologies, Cletronics, IRC, Optek Technology, Roxspur Measurement and Control, Semelab and Welwyn Components.

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