RCA Type 70-C

Key Features:

• Design Evolution: The RCA 70-C was a new design by RCA, mechanically similar to the earlier 70-A and 70-B models but with a new look.

• Turntable Size: Typically, RCA transcription turntables have a turntable diameter of around 16 inches, suitable for standard transcription records.

• Power Supply: RCA turntables generally require a power supply of 105 to 125 volts at 60 cycles (or 50 cycles for international models), consuming about 35 watts.

• Speeds: These turntables usually support multiple speeds, including 33 1/3 rpm and 78 rpm, to accommodate different types of records.

Technical Specifications (Based on Similar Models):

• Motor Type: High-torque synchronous motor, cushion-mounted for stability.

• Turntable Speed Regulation: Typically, these turntables have excellent speed regulation, with variations of about 0.6% at 33 1/3 rpm and 0.4% at 78 rpm.

• Pickup and Filter: The pickup is designed to reproduce both lateral- and vertical-cut records with a versatile filter unit.

Maintenance and Restoration:

• Cleaning: Regular cleaning is essential to maintain sound quality and longevity. This includes dusting external surfaces, cleaning the stylus, and lubricating moving parts.

• Component Replacement: Periodically replacing components like the stylus and belt can extend the turntable's lifespan.

• Professional Service: For complex repairs or restoration, consulting a professional service is recommended, especially for vintage models.

Historical Context:

• Broadcast Use: RCA transcription turntables were widely used in radio broadcasting for playing transcriptions and commercial records.

• Evolution: As technology advanced, these turntables were eventually replaced by digital systems in professional settings.