This incandescent lamp dates from the 1980's and was used in broadcast panel operator switches (lamp glows when the switch is active)
These are perfect for use in other equipment requiring such lamps, not just broadcast operator panels!
No manufacturer name found
No type or model number found
Single filament
DIMENSIONS:
Body (excluding leads) 8mm
Lamp envelope 3mm
Diameter 3.5mm
Lead length 7mm
The leads are rigid, wire but look to be tin plated so that direct soldering should be fine.
ELECTRICAL CHARACTERISTICS:
Cold filament resistance 9 Ohm
Applied a test voltage of 3V DC and the current drawn was 45mA so the hot resistance is around 65 Ohms
The filament colour at 3V is a yellow/orange of medium intensity
I would estimate the original supply voltage these were designed for would have been 6V maximum, perhaps 5V (common logic chip supply voltage)
At those voltages, these lamps are pretty power hungry with an estimated 90mA drawn off the supply for each lamp - imagine a panel with 100 lamps all indicating at the same time, that's a lot of current just for the indicators.
If the "hi tech" technology of incandescent lamps is "new" to you, these work on both AC or DC supplies and these particular lamps are designed to for long filament life (so the tech doesn't have to continually change the lamps!)
