Determining the Date of Manufacture of HP Instruments
revised Aug.4, 2008

I receive many inquiries about how to determing the date of manufacture of a particular HP instrument.  So on this section of the web site I will offer information that may help.  I am also asking people who visit this site and have a vintage instrument to send me information as described on the pages.  This information will be put into a database and eventually I will be able to post a serial number guide to the date of manufacture.

Dating Vintage HP instruments  This page focuses on the early oscillators made in the 1940s.

vintage_hp_oscillators.pdf  This is an article that describes early vintage HP oscillators from 1938 to 1941 and is richly illustrated with pictures.

More pages to come ...