Newmarket Never made germanium or silicon diodes? - UK Vintage Radio Repair and Restoration Discussion Forum

Boater Sam · 2nd May 2019, 7:05 pm

According to those who know, the Newmarket Transistor Company never produced diodes.
See http://www.wylie.org.uk/technology/s.../Newmarket.htm
In fact they advised the use of NKT 278 transistors as diodes.
So what then is NKT 449?
It's a metal button diode about 20mm in diameter with 2 pins on the back, one marked with a red dot.
A rectifier diode used in the SRX 25 Dynatron chassis for HT- supply.

G6Tanuki · 2nd May 2019, 7:49 pm

The americanradiohistory site has several issues of Practical Wireless in which there are ads for that.

In the 1960s there was a lot of 'rebranding' going on in the semiconductor industry just as also happened in the valve-industry: I can easily imagine that Newmarket could have 'bought-in' and rebranded devices from another manufacturer [ASM? Lucas Industries?] to fill a perceived gap in their component range.

2nd May 2019, 7:05 pm	#1
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Newmarket Never made germanium or silicon diodes? According to those who know, the Newmarket Transistor Company never produced diodes. See http://www.wylie.org.uk/technology/s.../Newmarket.htm In fact they advised the use of NKT 278 transistors as diodes. So what then is NKT 449? It's a metal button diode about 20mm in diameter with 2 pins on the back, one marked with a red dot. A rectifier diode used in the SRX 25 Dynatron chassis for HT- supply.

2nd May 2019, 7:49 pm	#2
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 13,995	Re: Newmarket Never made germanium or silicon diodes? The americanradiohistory site has several issues of Practical Wireless in which there are ads for that. In the 1960s there was a lot of 'rebranding' going on in the semiconductor industry just as also happened in the valve-industry: I can easily imagine that Newmarket could have 'bought-in' and rebranded devices from another manufacturer [ASM? Lucas Industries?] to fill a perceived gap in their component range.