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from Type 53/54[[C]] to Type [[CA]]. It was dropped after 1963. | from Type 53/54[[C]] to Type [[CA]]. It was dropped after 1963. | ||
The Type P does not contain any tubes, transistors, or tunnel diodes. | The Type P does not contain any tubes, transistors, or tunnel diodes. | ||
It does contain a [[selenium rectifiers|selenium rectifier]]. | |||
The selenium rectifier in the Type P has four sections and full-wave rectifies | |||
the 6.3 VAC that is supplied by the scope mainframe on pins 13 and 14. | |||
The 120Hz (assuming 60Hz mains) component of the full-wave rectified waveform | |||
is applied to the coil of the mercury switch to drive the opening and closing | |||
of the contacts. An adjustable fraction of the DC component of the full-wave | |||
rectified waveform is applied to the coil of the mercury switch to create a | |||
constant component in the magnetic field to bias the switch contacts to the | |||
best operating point. | |||
* [http://bama.edebris.com/manuals/tek/p/ Tektronix Type P Manual (PDF)] | * [http://bama.edebris.com/manuals/tek/p/ Tektronix Type P Manual (PDF)] | ||