ROTEL RA-611
¥ 49,500 (around 1973)
Commentary
This pre-main amplifier pursues cost performance while maintaining excellent characteristics and sound quality.
It uses a 2-power supply system OCL power amplifier connected to all stages.
A stabilizing power supply is provided for the equalizer and preamplifier circuit.
Pre and power can be separated.
Model Rating
| Type | Pre-main amplifier |
| Power Amplifier Unit | |
| Music power | 140W (4 Ω) 80W (8 Ω) |
| Effective power | 37W/37W (4 Ω) 30W/30W (8 Ω) |
| Harmonic distortion factor | 0.1% (8 Ω at 27W output) |
| Intermodulation distortion factor (70 hz : 7 khz = 4 : 1) | 0.15% (8 Ω at 1W output) 0.2% (at 28W output) |
| Frequency characteristic | 5 hz to 100 khz -3dB |
| Output Bandwidth Characteristics (IHF) | 5 Hz to 55 kHz |
| Damping factor | 35 (8 Ω) |
| Input Sensitivity / Impedance | 0.8V/33k Ω |
| Preamplifier Section | |
| Output voltage | 800mV |
| Harmonic distortion factor | 0.15% |
| Frequency characteristic | 5 Hz to 75 kHz |
| Signal-to-noise ratio | Phono1, 2 : 65 dB Aux, Tape in : 70 dB |
| Residual noise | 1mV |
| Input Sensitivity / Impedance | Phono1, 2 : 2.5mV/47k Ω Tuner, Aux1, 2 : 150mV/40k Ω Tape in : 230mV/47k Ω |
| Equalizer | RIAA deviation + 17 dB at 50 Hz -13.5 dB at 10 kHz |
| Loudness control | + 10 dB at 50 Hz, + 4 dB at 10 kHz |
| High filter | 10 kHz, -10dB |
| Low filter | 50 Hz, -10dB |
| Muting | -20dB |
| Tone control | Bass : ± 10 dB (50 Hz) Treble : ± 10 dB (10 kHz) |
| <General> | |
| Semiconductor used | Transistor : 26 Diode : 4 pcs |
| Pwer | AC100V/120V/220V/240V, 50Hz/60Hz |
| Power consumption | 150VA |
| External dimensions | Width 420x Height 140x Depth 240 mm |
| Weight | 7kg |