X381

The X381 is an experimental 560-series timebase plug-in. It appears to have used a 3B1 plug-in as a starting point.

The front panel has a Nixie display which is driven by a Fairchild 9960 decoder/driver IC.

Within the X381, there is an octagonal aluminum enclosure containing a backlit disk of film that is rotated by a front panel knob. The disk functions similarly to a quadrature optical encoder, but instead of generating just two signals, it generates several signals. There are human-readable numbers on the disk at each rotational position. These number are visible outside of the enclosure.

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  backlit with flashlight for photo

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  backlit with flashlight for photo