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The '''Tektronix Type 221''' is a miniature 5 MHz analog scope [[introduced in 1973]]. | The '''Tektronix Type 221''' is a miniature 5 MHz analog scope [[introduced in 1973]]. | ||
{{MissingSpecs}} | |||
==Internals== | |||
The 221 has a switching power supply and built-in rechargeable batteries (which are | |||
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]] | [[1N3713]] 1 mA [[tunnel_diodes|tunnel diode]]. The vertical output amplifier | ||
that drives the CRT plates is two opamps made from discrete transistors. One | that drives the CRT plates is two opamps made from discrete transistors. One | ||
drives the top deflection plate and the other drives the bottom plate. | drives the top deflection plate and the other drives the bottom plate. | ||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 221 1.jpg|Front | |||
Tek 221 right.jpg|Panel of 221 | |||
Tek 221 probe.jpg|Probe of 221 | |||
221-5.jpg|221 with orginal bag | |||
221-2.jpg|221 on top of 565 | |||
</gallery> | </gallery> | ||
[[Category:200 series scopes]] | [[Category:200 series scopes]] | ||