RCA RP-190

The RCA RP-190 is a 45 RPM automatic record changer designed to play and change up to 12 seven-inch records in sequence. Here's a technical overview based on available information:

Key Features:

• Record Capacity: Holds up to 12 seven-inch 45 RPM records.

• Record Type: Designed for RCA type seven-inch fine groove records.

• Power Supply: Requires 105-125 volts, 60 cycle AC power, with some models (RP-190-3) using an 85-volt, 60-cycle motor.

• Stylus Specifications: Uses a stylus with a tip radius of 0.001 inches and a pickup force of approximately 5 grams.

Technical Specifications:

• Drive System: The turntable is driven by a motor connected to an idler wheel, which engages with the turntable to rotate it. The idler wheel may require resurfacing or replacement if it becomes hard.

• Cycling Mechanism: The changer uses a complex cycling mechanism involving a trip lever, reject lever, and cycling slide to automate record changes.

• Lubrication: Requires light machine oil (SAE No. 10) for motor bearings and Houghton STA-PUT No. 320 for other bearing surfaces.

Maintenance and Restoration:

• Disassembly and Reassembly: Disassembly is necessary for thorough cleaning and repair, involving removal of the turntable and idler wheel.

• Component Replacement: Common issues include worn-out rubber motor mounts and idler wheels, which can be replaced or resurfaced.

• Electrical Grounding: Uses a separate ground lead for the changer base plate to reduce hum and noise.

Historical Context:

• Design Evolution: The RP-190 was designed to reduce parts count and costs compared to earlier models like the RCA 168, but its cycling cam may wear out faster.

• Usage: Popular in the mid-20th century for playing 45 RPM records, it has since become a collector's item and is often restored by enthusiasts.