The R.L. Drake Company produced the R-4B as a refinement of their previous popular R-4 and R-4A models. The R-4B covers: 3.5-4, 7-7.5, 14-14.5, 21-21.5 and 28.5-29 MHz plus ten additional 500 kHz crystal positions (with optional crystals). Modes of reception include: SSB, CW and AM. The dial accuracy is and impressive ±1 kHz. Features include: PBT, Line out, Crystal Calibrator (25 kHz), RF Gain, Mute Jack, Speaker Jack, Anti-Vox Jack and Dial Lamp. This radio requires an external speaker.
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Based on historic data, today's second-hand price of the Drake R-4B is around:
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