PHILIPS RH520
¥ 76,000 (around 1972)
Commentary
Pre-main amplifier with design and performance conforming to RH521.
The power amplifier section is designed to increase the bias current, so that notching and crossover distortion are reduced even when the signal is small.
Equipped with a speaker matrix circuit, 4-channel playback is possible.
Model Rating
| Type | Pre-main amplifier |
| Rated output | 15W + 15W (4 Ω, distortion 1% or less) |
| Music power | 20W + 20W (4 Ω) |
| Harmonic distortion factor | 0.1% or Less (10W + 10W) |
| Cross modulation distortion factor | 1% or Less (250 Hz to 8 kHz) |
| Power Band Width | 20 Hz to 30 kHz -3dB (1% distortion) |
| Frequency characteristic | 15 Hz ~ 40 kHz + 1-3 dB |
| Signal-to-noise ratio | -60dB or More (15W + 15W) |
| Crosstalk | -40dB or More (1 kHz) |
| Damping factor | 17 or More (4 Ω) |
| Input Sensitivity / Impedance (1 kHz at 15W output per channel) |
Phono : 2mV/50k Ω (DIN5P) Tuner : 100mV/100k Ω (DIN5P) Tape : 250mV/100k Ω (DIN5P) |
| Output terminal | DIN speaker connector : 2 (4 Ω ~ 8 Ω) DIN headphone connector : 1 (8 Ω ~ 600 Ω) |
| Rumble filter | 12dB/oct (-3dB at 70 Hz) |
| Scratch filter | 12dB/oct (-3dB at 7 kHz) |
| Tone control | Bass : ± 14 dB (50 Hz) Treble : + 13 dB ~ -16dB (10 kHz) |
| Loudness control | 5Hz:+11dB 10kHz:+6dB |
| Power consumption | 30W ~ 80W |
| External dimensions | Width 420x Height 117x Depth 280 mm |
| Weight | - |