Tunnel Diodes Available Off The Shelf.
‘What was there to see at the Physical Society Exhibition?’
is the start of a story, 50 years ago, in EW’s edition of February 1st 1961.
The story continues:
‘A six decade counter incorporating 131 tunnel diodes was shown. Expensive? – No – it was stated that a similar counter could now be built at a comparatively low cost.’
‘Form this one can but deduce that the tunnel diode is now an economic device and that some of the application problems have been overcome.’
‘The STC representative on whose stand the counter was shown, said that the use of the tunnel diode in shifts and multi-state circuits was now a straightforward matter.’
‘Logic circuits, however, still required the use of close-tolerance components.’
The story ends:
‘Applications of the tunnel diode were to be seen on several other stands notably RRE, Ferranti and Plessey.’
Elsewhere in the same issue, it was reported under the headline ‘Tunnel diodes off the shelf’ that off-the-shelf availability of tunnel diodes from STC had been made possible now that ‘a production phase is underway which has resulted in vastly improved reliability and sweeping price reductions.’