Artifact Details


7401A circuit board

Catalog Number



Physical object


Pro-log Corporation

Place Manufactured


Identifying Numbers

Model number 7401A Printed in white ink on the edge of the component side
Other number 001 Rubber stamped immediately to the right of the Assy #
Other number 10 Handwritten on a yellow sticker on the Thermocouple input
Other number 294 Printed on the edge of the solder side of the board
Other number 7401A-60 Printed in black on the extraction lever
Other number ASSY 110326- Printed in white ink on the component side


overall: 1/2 in x 4 1/2 in x 10 1/2 in


This double sided 7401A circuit board has a large "thermocouple" module with eight inputs and two check boxes. The one labeled "60Hz" is checked. Below that module are two rows of integrated circuits with some passive components. In the first row below the module there is a 522.24K crystal with "MF" stamped on the top. The "thermocouple" has three accessible variable resistors near the extraction lever. On the insertion end on the lower corner there is a green sticker. There is one quality control stamp on the solder side and one on the component side.


Component/circuit board


Gift of Warren Yogi

Lot Number