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Home › Magazines › 2009 › December › The Z550M: an unusual counter valve (ca. 1959)

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The Z550M: an unusual counter valve (ca. 1959)

Retronics section

Published in issue 396, December 2009

The Z550M: an unusual counter valve (ca. 1959)
To allow glow discharge valves to be operated directly by low-voltage transistor circuits, a pair of researchers at the Philips Research Lab developed the Z550M valve around 1959. The article tells the story.

Relevant websites

www.dos4ever.com/ring/Z550M.html
www.dos4ever.com/ring/ring.html

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Magazine December 2009
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