R series PDP-8 board information and R405 Crystal Clock

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This board is a crystal oscillator with output pulse amplifier. The frequency is stable to .01% over 0 to 55C. Frequency may be specified from 5kc to 2 mc (Current units 5kHz to 2 MHz) and is stamped on the crystal can. This board is 10 kc and makes a high pitched whine when operating.
This board cost $100 in 1968.

Schematic of board as a scanned PDF file.

Back of board ( 31K)

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Feel free to contact me, David Gesswein djg@pdp8online.com with any questions, comments on the web site, or if you have related equipment, documentation, software etc. you are willing to part with. I am interested in anything PDP-8 related, computers, peripherals used with them, DEC or third party, or documentation.

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