HP 2205A 141T Spectrum Analyzer Display Section Enclosure 430VA CRT Plugin Bay

HP 2205A 141T Spectrum Analyzer Display Section Enclosure 430VA CRT Plugin Bay

The HP 2205A is the display section and mainframe enclosure for the Hewlett-Packard 141T Spectrum Analyzer system. It houses the storage CRT display, all front-panel controls, the power supply, cooling system, and the open plugin bay that accepts the 141T-series plugin modules (such as RF section and IF section plugins). The unit powers on and the cooling fan runs normally. No plugin modules are included or installed.

Specifications & What's Included

• Make / Model: Hewlett-Packard 2205A / 141T Display Section
• Type: Spectrum analyzer display section and mainframe enclosure
• Display: Storage CRT with graticule
• Front panel controls: Trace Align, Auto/G, Storage mode (Store, Fast, Sto., Erase, Conv.), Writing Speed, Time, Persistence, Intensity, Focus, On/Line switch
• Plugin bay: Open — accepts HP 141T-series plugin modules (no plugins included)
• Plugin bay connectors: Two large parallel plugin interface connectors present
• Rear connectors: Z Axis Input (BNC), EXT/INT switch, AUX A and AUX B (Series TG-1 parallel connectors)
• Power input: 100 / 130 / 220 / 240V selectable, 48–66 Hz, 430VA MAX
• Fuse ratings: 4AT at 100/130V; 2AT at 220/240V
• Form factor: Benchtop / rackmount chassis with rack ears
• Rear panel: HP Tested By / Inspected By certification labels present
• Included: Display section and enclosure only — no plugin modules, no cables

Applications

The HP 141T is a modular spectrum analyzer system that Hewlett-Packard introduced in the late 1960s and continued producing and supporting through the 1970s and into the 1980s. The mainframe (the 2205A display section) serves as the chassis that powers and houses interchangeable plugin modules: an RF section plugin determines the frequency range covered (e.g., 100 kHz to 110 GHz depending on the plugin), and an IF section plugin sets the resolution bandwidth and sweep characteristics. This modular architecture made the 141T one of the most versatile spectrum analyzer platforms of its era, used extensively in microwave and RF labs, telecommunications research, radar development, and government and military test facilities. Today, 141T systems are sought by vintage electronics restorers, university labs maintaining legacy test benches, and RF engineers who still rely on analog spectrum analyzers for certain measurement tasks. This display section is the essential mainframe component — it is the starting point for building or restoring a complete HP 141T system.