Hughes International (UK) was part of the US company Hughes Aircraft. It established a high-tech semiconductor factory in Glenrothes, Scotland, about 1960 (part of the so-called 'silicon glen'). This facility seems to have manufactured primarily diodes, both germanium and silicon. The company logo was a large capital 'H'.
At some point, EMI obtained a 49% holding, and the company was renamed EMIHUS Microcomponents Limited (EML), but retained the 'big H' logo. Later, EMI sold their holding back to Hughes, which became Hughes Microelectronics. Then in 1975 Hughes Microelectronics merged with Raytheon and became Raytheon Systems. There is little detail of these changes on the Net.
The only source of data that I possess on Hughes International's products is a booklet 'All Products Catalogue' dated May 1965. This does include a good number of silicon transistors and the introduction states the products are '... produced ... at Glenrothes ...'. However, the majority are 2N series types that may have been shipped from the US.
I have relatively few Hughes International devices.
The catalogue starts with a section on 'germanium signal diodes' comprising four series:
The images show an HG1005 and an HG5009 used on circuit cards from a LEO III computer.
A number of the above are type-approved in the UK military CV series. The ones in the 1963 Register are:
CV9401 = HG1001 | CV7041 = HG1005 | CV10032 = HG1005 | CV7130 = HG1006 |
CV10691 = HG1007 | CV9414 = HG1010 | CV8636 = HG1012 | CV9725 = HG1086 |
CV10825 = HG1087 | CV7127 = HG5004 | CV10089 = HG5004 | CV10227 = HG5008 |
CV9694 = HG5009 | CV9176 = HG5081 | CV10226 = HG5085 |
I think these CV7127 are Hughes-made, although they do not bear any manufacturer or date code. CV7127 has prototypes HD2595, 85P1, AAY12, AAZ17, and HG5004.
Next follows a section on 'silicon switching diodes' comprising two series:
Two of the planar epitaxial diodes are type-approved in the UK military CV series.
Then a section covers 'Zener diodes' comprising two series:
Then a number of sections on other diodes that I shall not list in detail:
Then we come to transistors. There are five sections of normal transistors, nearly all 2N types. I list only the non-2N ones:
There are also two sections on silicon 'glass ambient' transistors: GAT1000 - GAT1003 and GAT2000 - GAT2002.
A number of the above transistors are type-approved in the UK military CV series. The only ones in the 1963 Register are:
- CV10066 = HT100
- CV7417 = HT101