ONKYO Integra A-2500
¥ 30,000 (around 1975)
Commentary
A pre-main amplifier of the Integra GT series equipped with various functions.
Equipped with 2 types of tape input.
It is equipped with switching and simultaneous playback by connecting two speakers.
Equipped with microphone mixing and mixing recording functions.
Model Rating
| Type | Pre-main amplifier |
| Power Amplifier Unit | |
| Rated output | 23W + 23W (8 ω, 1 kHz) |
| Total harmonic distortion rate (1 kHz) | 0.8% or Less (Rated Output) 0.05% or Less (at 10W Output) |
| Intermodulation distortion factor (SMPTE70Hz : 7 khz = 4 : 1) | 0.05% or Less (at Rated Output) |
| Power Band Wiz (IHF -3dB, THD 0.5%) | 10 Hz to 30 kHz |
| Signal-to-noise ratio | 90 dB or more (C network) |
| Damping factor (DC ~ 20 kHz) | 40 (8 Ω) |
| Load impedance | 4 Ω ~ 16 Ω |
| Output terminal | Speaker : A, B, A + B Headphone jack |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono1, 2 : 2.5mV/50k Ω Mic : 5mV/50k Ω Tuner, Play1, 2 (Aux) : 200mV/50k Ω |
| Total harmonic distortion factor (at 1 v output) | Not more than 0.05% |
| Intermodulation Distortion Factor (SMPTE, 70 hz : 7 khz = 4 : 1) | 0.05% or Less (at 1 V Output) |
| RIAA deviation (30 Hz to 15 kHz) | ± 0.5 dB or less |
| Phono Maximum Allowable Input (1kHz/10kHz) | 100mV(450mV)RMS 280mV(1.24V)P-P |
| S/N (IHF A network, input shunt) | Phono1, 2 : 70 dB or more Tuner, Play1, 2 (Aux) : 90 dB or higher |
| Output Voltage / Impedance | Din : 30mV/50k Ω (at 100k Ω load, rated output) Rec out : 200mV/10k Ω (open-end rated output) |
| Tone control | Treble : ± 9 dB (10 kHz) Bass : ± 9 dB (100 Hz) |
| <General> | |
| Semiconductor used | Transistor : 13 IC : 2 Diode : 11 units |
| AC Output | Total 300 VA |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 50W (4 Ω load, Electrical Appliance and Material Control Law) 132W (4 Ω load, maximum power consumption) |
| External dimensions | Width 410x Height 143x Depth 297 mm |
| Weight | 6.3kg |