Product Overview
Chicago Miniature Lamp 757 Indicator Bulb 28V BA9s Base
Condition
Unused new old stock. Stamped on metal collar: CML 757 28V. Sourced from surplus inventory, manufactured in England. Sold each.
Same or next business day shipping from our Idaho warehouse. Reliable parts since 1999. Honest pricing, no nonsense.
We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
Chicago Miniature Lamp model 757 is an incandescent miniature indicator bulb built on a standard BA9s single-contact miniature bayonet base. Designed for 28-volt instrument panels, aviation annunciators, and industrial control indicators, this T-3 1/4 tubular lamp draws 0.08 amps and provides 0.62 mean spherical candlepower with a C-2F filament design.
Key Features
- Standard BA9s miniature bayonet base with dual indexing pins and single bottom contact
- 28V nominal operating voltage drawing 80 mA (0.08A)
- T-3 1/4 tubular glass envelope with 28 mm overall length
- Rated luminous intensity of 0.62 MSCP
- C-2F filament structure engineered for reliable instrument illumination
- Metal base collar stamped with part number CML 757 and 28V
Applications
- Replacing burned-out 28V annunciator and caution-panel indicator lamps in aircraft cockpits and ground equipment
- Servicing legacy industrial control consoles and illuminated pushbuttons designed for miniature bayonet bulbs
- Restoring vintage benchtop test instruments, telecom switchboards, and marine electronics using 28-volt indicator circuits
- Custom electronics projects and retro indicator panels requiring low-draw incandescent illumination
Frequently Asked Questions
What base style does this lamp use?
It uses a standard BA9s miniature bayonet base, featuring a 9 mm collar diameter with two opposing bayonet pins and a single electrical contact on the base bottom.
Can this lamp run directly from a 12V or 24V supply?
The lamp is rated for 28V operation. On a 24V supply it operates at slightly reduced brightness and extended life, while a 12V supply produces very dim output.
What industry cross-reference numbers match this lamp?
This bulb interchanges directly with standard industry number 757, CM757, and military designation 6240-00-941-8488. More pieces cost less each - the price-break table on this page shows what each quantity costs.
A classic bayonet indicator that clicks into place with a quarter-turn and glows steady. Built for cockpit panels and instrument racks that still rely on honest tungsten.
