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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.
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| 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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.. | Hewlett-Packard 521C | ..
Early Digital Test Equipment |
bhilpert |