• on Education & Information
  • Published in issue 12/2009 on page 76
About the article

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

Retronics section

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.
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