Digital Test
Hewlett-Packard 521C

Manufacturer: Hewlett-Packard
Model: 521C
Year: 1960
Schematic: MF
Max. Rate: 120 KHz
Display: 1-of-10 neon
Digits: 5
Logic: tube

One of the models from HP's 520 series. There are 44 vacuum tubes in this model.

This unit was made in 1960 but the model actually dates from the mid-50's.


- Unit Log -

Serial Number: 010-04048
Year of Manufacture: 1960 (Capacitor stamped with "6017"). The manual contains dates from 1954 to 1956.
Date of Receipt: ~1999
State upon Receipt: Functional. Some scratches in cabinet paint but very clean and very good overall condition.

Date: 2006 Apr 27
Procedure: Powered up. Functional.

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Early Digital Test Equipment