Shaun Merrigan

Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography

Tag: Hewlett Packard

Hewlett Packard 8443A Tracking Generator

29/11/2025

Hewlett Packard (HP), Restoration of Classic Electronic Test Equipment

The HP 8443A is a compact, rackable tracking generator and frequency counter designed to work with HP spectrum analyzers; it produces a swept CW output that follows the analyzer marker for easy swept-response and marker‑based measurements, while offering a built‑in counter and stable 1 MHz timebase for accurate frequency readout. Overview The HP 8443A Tracking…
HP 8903B Audio Analyzer PCB Pad Replacement

13/11/2025

Audio Test Equipment, General, Hewlett Packard (HP), Restoration of Classic Electronic Test Equipment

Originally posted in August 2017 HP 8903B Audio Analyzer PCB Pad Replacement Visual inspection of my recently acquired HP 8903B Audio Analyzer revealed that the polymer pads on the bottom side of the main PCB were seriously deteriorated: Besides making an unsightly mess, this residue may form corrosive products which, over time, could damage the PCB.…

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