Product Overview
120V 25mA T-2 Miniature Incandescent Pilot Light Bulb
Condition
Unused new old stock. Markings legible: 120PSB. Clear glass envelope and internal filament intact. Sold each.
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Product Overview
Engineered for direct line-voltage signaling, the 120PSB is an industry-standard T-2 miniature incandescent indicator lamp. Built with an ANSI #5 telephone slide base and a clear tubular glass envelope, it provides steady illumination for control panels, legacy switchboards, and illuminated pushbutton switches.
Key Features
- Lamp type: T-2 miniature incandescent indicator lamp
- Operating voltage: 120 VAC
- Current draw: 0.025 A (25 mA)
- Power consumption: 3.0 W
- Base type: ANSI #5 telephone slide base (TS5)
- Filament configuration: CC-7A coiled-coil
- Overall length: 28 mm
- Bulb diameter: 6.35 mm (1/4 in)
Applications
- Replacing burnt-out pilot lamps in vintage telecom relay racks, PBX equipment, and central-office annunciators
- Restoring illuminated pushbuttons and pilot light assemblies on legacy industrial machinery and motor starter panels
- Direct-line 120V status indicators in custom bench power supplies, audio gear, and maker control consoles
Frequently Asked Questions
What socket type does this lamp require?
This lamp uses an ANSI #5 slide base (also designated TS5 or telephone slide base No. 5), sliding directly between dual spring-clip contacts.
Does this bulb require an external ballast or dropping resistor?
No. It operates directly from a standard 120 VAC power source at 25 mA without external step-down components.
What industry part numbers interchange with 120PSB?
Standard cross-references for the 120PSB include 120PSB-, Satco S7816, and Sylvania 34557, sharing the same 120V 25mA rating and T-2 slide base form factor.
A miniature glass beacon from the era of spring-leaf sockets and click-clack switchboards. Push it into the clip, throw the switch, and watch that warm incandescent filament tell you the circuit is alive.
