Phantastron
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The Phantastron is a self-gating linear sawtooth generator circuit based on a pentode/triode Miller integrator.
![](http://w140.com/tekwiki/images/thumb/4/4e/Phantastron_mulvey.png/400px-Phantastron_mulvey.png)
It is used in the 162, 512 and possibly other instruments.
See description on page 26 of this document:
- John Mulvey, Some Basic Vacuum Tube Circuits used in Tektronix Instruments (Third Revision 1964) / (1960 edition)