Astron RS50A

The Astron RS-50A is a heavy-duty, linear regulated DC power supply widely used for high-current radio and communications equipment, delivering 37 amps continuous and 50 amps peak output at 13.8 Vdc.
Key Features & Specifications
The Astron RS-50A is known for its rugged construction and clean, stable power output, which is ideal for sensitive electronics like amateur and CB radios.
Output Current: 37 Amps continuous duty, 50 Amps intermittent communication service (ICS).
Output Voltage: 13.8 VDC (internally adjustable from 11 to 15 VDC).
Regulation: Solid state electronically regulated, providing very low ripple (less than 5mV peak to peak) and noise.
Protection: Features include fold-back current limiting and crowbar over-voltage protection to safeguard the unit and connected equipment.
Cooling: Utilizes a heavy-duty heat sink for cooling, meaning no fan noise during operation.
Dimensions & Weight: Measures approximately 6 x 13.75 x 11 inches and weighs around 46 lbs, built like a “tank” according to many users.
User Reviews & Expert Opinions
Owners often praise the RS-50A for its exceptional reliability, robust build quality, and quiet operation, which are highly valued in radio applications where RFI (radio frequency interference) can be an issue.
Reviewers commend its stable regulation and zero RFI, calling it a “beast” that is very quiet.
Multiple users mention owning their units for over a decade, with some still in regular use after 25-30 years, highlighting their long service life.
The simple design makes it easy for a competent technician to repair if needed, using common parts.
One common observation is that the voltage adjustment potentiometer is located on the underside of the internal regulator board, which can be slightly awkward to access for non-stock voltage settings.