128: Difference between revisions

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+120V DC, and unregulated +6.3V DC.  Low voltage rectification is done by a
+120V DC, and unregulated +6.3V DC.  Low voltage rectification is done by a
[[selenium_rectifiers|selenium rectifier]].  Higher voltage rectification is done
[[selenium_rectifiers|selenium rectifier]].  Higher voltage rectification is done
by a [[6X4]] tube.
by a [[6X4]] tube.  The voltage reference for the +120V supply is produced by
a [[5651]] tube.


* [http://w140.com/tek_128.pdf Tektronix 128 Manual (PDF)]
* [http://w140.com/tek_128.pdf Tektronix 128 Manual (PDF)]

Revision as of 23:22, 26 August 2012

The Tektronix Type 128 is a power supply for Type P500CF cathode-follower probes. It was introduced in 1958. It provides two voltages to the probe: regulated +120V DC, and unregulated +6.3V DC. Low voltage rectification is done by a selenium rectifier. Higher voltage rectification is done by a 6X4 tube. The voltage reference for the +120V supply is produced by a 5651 tube.