Please, visit my workbench pages for detailed work on some units.
Enjoy!
73 JOSE - EB5AGV
HP-8414A/B Overlay Graphs provided by Chris Trask N7ZWY
HP-8555A A10 Wiring Map provided by Paolo Mantovani
HP Cross-reference Integrated Circuits by John Barnes
HP Cross-reference Batteries, Transistors and Diodes by John Barnes