>Fiber optic analog pre-amp transmitter p/n 29W4143, used, taken from working condition, missing side panels, stickers on the front may vary. This has two interesting Datel chips, a SHM-HMUC hybrid sample-and-hold, and an ADC-816MC A/D converter, in sockets.
Check my listings for the corresponding receiver
NOTE: This has been modified to run on +15V and -15V rather than the usual positive and negative 12V