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221: Difference between revisions
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a maintenance issue). It has a transformer-coupled trigger circuit which | a maintenance issue). It has a transformer-coupled trigger circuit which | ||
would seem to preclude DC level-based triggering. The trigger circuit uses a | would seem to preclude DC level-based triggering. The trigger circuit uses a | ||
[[1N3713]] 1mA [[tunnel diode]]. The vertical output amplifier that drives the | [[1N3713]] 1mA [[tunnel_diodes|tunnel diode]]. The vertical output amplifier that drives the | ||
CRT plates is two opamps made from discrete transistors. One drives the top deflection | CRT plates is two opamps made from discrete transistors. One drives the top deflection | ||
plate and the other drives the bottom plate. | plate and the other drives the bottom plate. | ||
* [http://manoman.sqhill.com/pdf/tek-221.pdf Tektronix 221 Manual (PDF)] | * [http://manoman.sqhill.com/pdf/tek-221.pdf Tektronix 221 Manual (PDF)] | ||