Alpine 3506
Documentation on the Alpine 3506 is thin. A single period review is essentially all that survives. HiFI-Stereo (August 1983, p.24) examined it as a car-stereo cassette/tuner unit and noted a few specifics. The volume control had a detented feel similar to the tuning knob, but it actually varied level smoothly rather than in discrete steps. Pressing the tuning knob ejected a loaded cassette. The tuner's stereo indicator stayed lit down to about 11 dBf (1.1 AV into 75 ohms), which the reviewer noted merely confirmed a stereo pilot carrier was present rather than indicating reliable reception. The instruction manual claimed interstation-noise muting, but the test sample did not mute unless a station was recalled via the preset buttons. In seek mode the tuner stopped on signals, but the muting did not function as described (p.25). Beyond this review, no official specifications have been found - no power output, frequency response, distortion figures, or production years.
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