Pioneer A-2050
¥ 58,000 (around 1979)
Commentary
Pre-main amplifier using class AB operation system.
A DC configuration is adopted in which the condenser is removed from the NFB circuit.
Uses a 3-transformer 3-power supply system with a dedicated transformer for small signal on the left and right sides of the power section.
Uses a 32-step attenuator type volume.
Model Rating
| Type | Stereo pre-main amplifier |
| Effective output (both channels driven, 20 Hz to 20 kHz) | 35W + 35W (8 Ω) |
| Harmonic distortion factor (20 Hz to 20 kHz) | 0.03% (at effective output) |
| Output Bandwidth (IHF, bi-channel drive, 0.05% distortion factor) | 10 Hz to 70 kHz |
| Frequency characteristic | Phono : 20 Hz to 20 kHz ± 0.2 dB |
| Signal-to-noise ratio | Phono:86dB |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption (Electrical Appliance and Material Control Law) | 145W |
| External dimensions | Width 381x Height 83x Depth 329 mm |
| Weight | 7.7kg |