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NuTone Intercom Photo Gallery > NuTone Stereo Music Intercom Model SM428 > NuTone SM428 AM FM stereo tuner module

NuTone SM428 AM FM stereo tuner module

The AM FM Tuner in the SM428 i salmostthe same tuner that is used in the Models IMA303 and IMA406.  The difference is a small connector on the side of the circuit board which allows the "Stereo" indicator lamp to light up when stereo reception is present.

The Stereo Indicator lamp must be replaced with exactly the correct bulb, otherwise it will damage the IC that drives the lamp.