Vintage Ediswan Mazda XB103 Germanium Transistor

EDISWAN Germanium transistor originally from the late 1950s. The gain on this one is at the very top end of the gain spec @ 105.

Edison and Swan merged in the UK in the late 1800s when Swan already held the dominant patents for the incadescent bulb.

Ediswan were one of the original companies in the Associated Electrical Industries (AEI) merger from 1929 which included British Thomson Houston. Thomson Houston in the US became General Electric.

Many British lamp companies moved into valves (tubes). Indeed, the inventor of the first thermionic valve, Ambrose Fleming, worked at Edison Swan's factory at Ponders End in North London.

Siemens Brothers (the other brothers) merged with Edison Swan in the early 1950s.

It's not clear where Ediswan semiconductors were manufactured but may have been at Woolwich or Ponders End. Siemens Edison Swan had a research lab in West Road, Harlow in the late 1950s doing semiconductor research, which became the AEI Harlow Research Laboratory in 1961.

Talk about branding confusion -

Siemens Edison Swan Ltd...
An A.E.I. Company...
EDISWAN semiconductors...
And throw the Mazda brand in as well for good measure !

hfe=105, Vf=129mV. The part looks awfully new but I can’t imagine the transistor and box are copies.
spingalhistory.blogspot.com

Taken on: August 15, 2017

Tags:

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mazda

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Sets appears in: • Vintage Electronics • Sigma Art E Mount

Groups appears in: • The Secret Life of Technology • Artistic Photography more » • Vintage Electronics • Vintage Technology • Vintage Computers • Computer History • Technology close up • Historic UK and Ireland • Art of Technology • SONY ALPHA CLUB • Dyxum Members on flickr • Science, Technology, History • The Best of ArT [P1/P2] • Robots, Automatons, Mainframes and the Silicon Revolution • Sigma DN Lens • SIGMA 60mm F2.8 DN • Art | SIGMA 60mm F2.8 DN • Sony α5000 • Sigma Art DN Classic Lenses « less

Camera: Sony ILCE-5000, f/7.1, 1/60 sec, 60mm (=90mm), ISO 100 (more info) (hide info)

Camera:	Sony ILCE-5000
Aperture:	f/7.1
Exposure Time:	0.017 sec (1/60)
Focal Length:	60mm (35mm equivalent: 90mm)
ISO:	100
Exposure Bias:	0 EV
Flash:	On, Return detected
Exposure Program:	Aperture-priority AE
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Manual
Light Source:	Unknown (Day white fluorescent)
Color Space:	sRGB
Software:	GIMP 2.8.20
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