Marantz 2252
The Marantz 2252 is a stereo receiver from the mid-1970s and belongs to the third generation of the famous 22xx series. Its signature blue dial, gyro-touch tuning, and symmetrical faceplate reflect Marantz's golden-era styling.
The main power supply consists of a fairly large transformer and two 10000µF filter capacitors. The power amplifier is fully discrete and uses 2SC1343 and 2SA753 TO-3 output transistors. Speaker protection is handled by a relay.
The FM tuner section uses a 3-gang tuning capacitor and three 10.7MHz ceramic filters. The FM discriminator is built around the HA1137W while stereo decoding is handled by the HA1196 IC.
Known for its robust build and warm, musical sound, the 2252 strikes a balance between power and refinement.
Manufacturer: Marantz
Status: Active company
Official website: marantz.com
General Specifications
Maximum power (8Ω): 52WFrequency response (±0.2dB): 20Hz-20kHz
THD: 0.1%
IMD: 0.1%
Signal to noise ratio (Line): 88dB
Signal to noise ratio (Phono): 76dB
Input sensitivity (Line): 180mV
Input sensitivity (Phono): 1.8mV
Damping factor: 45
Speaker load impedance: 8Ω-16Ω
Dimensions (WHD): 440×137×365mm
Weight: 14.0kg
Produced: 1975-1978
Initial price: $450
Measured Values
Maximum power (8Ω): 55WFrequency response (20Hz-20kHz): <2.0dB
Channel imbalance: <1.5dB
THD (1kHz, 1W): 0.0085%
THD+N (1kHz, 1W): 0.036%
THD (1kHz, 20W): 0.0084%
THD+N (1kHz, 20W): 0.048%
IMD (70Hz, 5kHz, 1W): 0.034%
Noise: -49.4dB
Amplification: 112.2
DC offset L: -1.1mV
DC offset R: -2.5mV
Factory Specification Sheet
Factory specification images are sourced directly from the device's original service manual or user manual. These documents are produced by the manufacturer and provide authoritative information on the product's specifications.
Maximum Power
Maximum power is measured using 8Ω resistors on both channels. A 1kHz sine wave input signal is applied and gradually increased until higher harmonics rise significantly. Typically, this is the point at which output clipping occurs.
Frequency Response
Frequency response is measured using several equilizer settings. 'Flat' indicates the tone controls are either turned off or set to their neutral position. 'Max' and 'Min' refer to the maximum and minimum tone control positions, respectively. In the phono section, the expected response follows the RIAA equalization curve.
Residual Noise
These graphs display the noise levels at various volume positions. To eliminate any interference from the input signal, the input lines are shorted during the measurement. Generally, the noise is highest at the mid-point of the volume range (50%)
Distorsion
Total harmonic distortion (THD) is measured using a 1kHz sine wave input, with the output level adjusted to meet different conditions. Intermodulation distortion (IMD) is measured using 'two sine' input signal. THD versus voltage is measured with a 1kHz sine wave input, while THD versus frequency is measured at various output levels.
FM Tuner
Measurements of the tuner section were performed using an FM signal generator, with its output fed directly into the antenna input. AM measurements were not conducted.
