Valcom V-9939C Microphone Adapter
The V-9939C is a wall-mount microphone adapter that gives a paging microphone access to a zone of one-way amplified speakers, or to a standalone paging setup. It's the component that sits between a handheld or gooseneck mic and a Valcom paging zone, converting a push-to-talk input into a live page over commercial speaker infrastructure. If you're wiring a front-desk or dispatch paging station and need a dedicated access point into a single zone rather than the whole system, this is the part that makes that connection.
Compatibility
The V-9939C is built for Valcom one-way paging speaker zones and standalone paging systems, with connector terminals for microphones and push-to-talk switches. Input impedance is switchable between Low Z and Hi Z, so it pairs with either low-impedance dynamic mics or high-impedance gooseneck/handheld mics without an external matching transformer. Output is 600 Ohms at -10 dBm nominal line level, sized to feed directly into a paging zone amplifier input. Onboard Form C auxiliary relay contacts let the adapter trigger external switching — chime circuits, zone selection, or third-party paging controllers — anywhere a dry contact closure on push-to-talk is useful.
Installation Notes
The V-9939C mounts directly at the microphone location and runs on -24 Vdc nominal power, drawing 40 mA — a light enough load to share a paging system's existing power supply. It's rated for indoor use across 32 to 122°F (0 to 50°C) and 0-85% non-condensing humidity, so keep it out of unconditioned exterior enclosures. The housing is gray painted aluminum alloy at 8.25"H x 4.50"W x 2.35"D and weighs 0.70 lbs (3.40 lbs shipping), light enough for standard wall-box or surface mounting without added bracing.
