Product Overview
Radion ZSP-1630 6.5V 2.75A Double Contact Optical Prefocus Replacement Bulb
Condition
New old stock (NOS). Sold each. Clear glass envelope and intact coiled filament on a slotted double contact base with dual solder contacts. Labeled ZSP-1630 6.5V 2.75A.
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Product Overview
Compact incandescent optical bulb engineered for precision illumination in laboratory and analytical equipment. Operating at 6.5 volts and 2.75 amps, the ZSP-1630 uses a keyed, slotted mounting flange and double contact base to maintain exact filament alignment within optical light paths and condensing lens systems.
Key Features
- Voltage rating: 6.5 V
- Current rating: 2.75 A
- Base type: Double contact flanged prefocus base with three locating slots
- Envelope: Clear glass S-8 bulb
- Filament design: Coiled horizontal filament supported on dual rigid posts
- Electrical connection: Dual solder contact nubs on bottom base
Applications
- Replacing burned-out illuminator bulbs in vintage laboratory microscopes and optical inspection fixtures
- Servicing photometric equipment and turbidity instrumentation requiring fixed-focus 6.5V lighting
- Bench projects and custom optical setups needing a rugged low-voltage incandescent point source
Frequently Asked Questions
What is the purpose of the slotted metal flange on the base?
The prefocus flange indexes into the lamp socket using three locating cutouts, ensuring the filament is mechanically locked into the exact optical focal point of the reflector or condensing lens.
What base style does this bulb use?
It uses a double contact prefocus base with two insulated solder terminals on the base bottom and a circular positioning flange.
What common trade numbers does the ZSP-1630 correspond to?
This bulb matches standard ANSI 1630 miniature lamp specifications rated at 6.5V and 2.75A in an S-8 flanged envelope.
A prefocus flange exists so you drop the lamp in, lock the ring, and never have to chase the focal point with an Allen wrench. Drop it into the socket, latch the collar, and get back to what was on the slide.
