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The triggering in the 556 is done using tunnel diodes and the trigger circuit sits on its own small PC board | The triggering in the 556 is done using tunnel diodes and the trigger circuit sits on its own small PC board | ||
just behind the trigger source selection switch. | just behind the trigger source selection switch. | ||
A rack-mount version, the RM556 also exists. | |||
<gallery> | |||
Image:Rm556.jpg|Front view. | |||
Image:Rm556 trigboard.jpg|Trigger board contains two tunnel diodes and a reed relay. | |||
Image:Rm556 top2.jpg|Top view. | |||
Image:Rm556 output amp.jpg|Output amplifier driving deflection plates. | |||
</gallery> |