The 51S-1 has effective rejection tuning as well. As factory standard, it has bandwidth filters for AM, LSB, USB and CW. The audio is remarkably smooth and pleasant to listen to. Sensitivity is still comparable to today's latest receivers. And it still will take your breath way every time you have the opportunity to enjoy it. But the Collins gear will be ready and able to do the job. When(if) the A bombs go off with the resulting EMP, all the Icoms, Yaesus, TenTecs and Kenwoods will be instantly rendered as useless junk. This is genuine military grade equipment. foreign embassy had one of these masterpieces for over 30 years! People's very safety and their lives depended on reliable military and state communication and the Collins always came through. It is not a Z0-6 Vette but it was the L-88 receiving giant of its day. The 51S-1B is similar to the 51S-1, but it has a rear-mounted junction box that provides military-type connectors for power, control, audio, and antenna lines. The rack-mounted ac version is model 51S-1F, while the rack-mounted dc version is model 51S-1AF. The 51S-1A is similar, except that it is fitted with a 28-volt dc transistorized power supply. The model 51S-1 is mounted in a perforated wrap-around cabinet and equipped with an ac power supply capable of 115- or 230-volt, single-phase, 50-to 400-Hz operation. Coverage is continuous in thirty 1-megahertz bands.

The 51S-1/1A/1F/1AF/1B Receiver receives USB, LSB, AM, and CW signals in the range of 0.2 to 30.0 MHz.

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Collins 51s-1 review