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-The Tektronix Type 128 is a power supply for Type [[P500CF]] cathode-follower probes.
+{{Instrument Sidebar
-It was [[introduced in 1958]].  It provides two voltages to the probe: regulated
+|manufacturer=Tektronix
-+120V DC, and unregulated +6.3V DC.  Low voltage rectification is done by a
+|model=128
-[[selenium_rectifiers|selenium rectifier]].  Higher voltage rectification is done
+|class=Power supply
-by a [[6X4]] tube.  The voltage reference for the +120V supply is produced by
+|series=
-a [[5651]] tube.
+|summary=Probe power supply
+|image=Tek 128 front.jpg
+|caption=Tektronix Type 128
+|introduced=1958
+|discontinued=(?)
+|designers=
+|manuals=
+* [[Media:070-063.pdf|Tektronix Type 128 manual]] (PDF)
+* [[Media:Tek 128 dummy load.pdf|Tektronix Type 128 Dummy Load]]
+}}
+The '''Tektronix Type 128''' is a power supply for up to two [[P500CF|Type P500CF]] or [[P170CF|Type P170CF]] cathode-follower probes.
+It was [[introduced in 1958]].
-* [http://w140.com/tek_128.pdf Tektronix 128 Manual (PDF)]
+It provides three DC voltages − regulated +120 V @ 25 mA, and two independent unregulated +6.3 V @ 150 mA circuits, one for each probe socket.
+Low voltage rectification is done by a [[selenium_rectifiers|selenium rectifier]], plate voltage rectification by a [[6X4]] tube.
+The voltage reference for the +120 V supply is produced by a [[5651]] tube.
+==Pictures==
 <gallery>
-Image:Tek 128 manphoto.jpg|Catalog photo
+Tek 128 front.jpg
-File:Tek 128 schematic.png|Schematic
+Tek 128 front2.jpg
+Tek 128 right.jpg
+Tek 128 left.jpg
+Tek 128 rear.jpg
+Tek 128 manphoto.jpg|Catalog photo
+Tek 128 schematic.png|Schematic
 </gallery>
+[[Category:Accessory power supplies]]