Tuner / Preamp / Power Amp Combo
These are in nice condition! Original box, packing, and manuals are not available for these.
Yamaha T-7 is Natural Sound AM/FM Stereo Tuner (1980-82) and features 10-station presets, selectable local/auto DX modes, optical balance tuning and FM muting.
Yamaha C-4 is a Natural Sound Stereo Control Preamplifier (1979-81).
Yamaha M-4 is a Stereo Power Amplifier (1978-83) with 120 watts per channel into 8Ω (stereo).
There are spec sheets for each at end of pix. To read the specs better go to the audiogon listing.