| Title | Value |
|---|---|
| MAIN section | MAIN section |
| Power output : | 125W (IHF, dynamic, 4 Ohm) |
| 82W (IHF, dynamic, 8 Ohm) | |
| 2x 45W (4 Ohm, each channel driven at 1Khz) | |
| 2x 33W (8 Ohm, each channel driven at 1Khz) | |
| 2x 36W (4 Ohm, both channels driven at 1Khz) | |
| 2x 26W (8 Ohm, both channels driven at 1Khz) | |
| THD : | 0,1% at rated output |
| 0,03% at 10W output | |
| IMD : | 0,05% at rated output |
| Power bandwidth : | 10Hz...100Khz (IHF -3dB, 0,2% THD) |
| Frequency response : | 10Hz...70Khz (+0 / -1dB) |
| S/N ratio : | 110dB (IHF-A) |
| Damping factor : | 80 at 8 Ohm |
| Load impedance : | 4...16 Ohm |
| Input : | 1V / 100kOhm |
| PRE section | PRE section |
| Inputs : | 1,2 / 2,4 / 4,8mV / 50kOhm (phono) |
| 100mV / 100kOhm (lines) | |
| RIAA deviation : | ±0,5dB (30Hz...15Khz) |
| Phono overload : | 230mV (RMS at 1Khz) |
| 1,1mV (RMS at 10Khz) | |
| Output voltage : | 1,1V / 2kOhm (pre out) |
| 100mV / 10kOhm (rec out) | |
| THD : | 0,03% at rated output |
| IMD : | 0,05% at rated output |
| S/N ratio : | 75dB (phono, IHF-A) |
| 90dB (lines, IHF-A) | |
| Bass control : | ± 5dB at 125Hz or 400Hz |
| Treble control : | ± 5dB at 2Khz or 8Khz |
| Low filter : | 6dB/octave below 30Hz |
| High filter : | 6dB/octave below 7Khz |
| Loudness : | +9dB at 70Hz |
| +5dB at 10Khz | |
| Semiconductors : | 11 transistors |
| 13 diodes | |
| 2 ICs | |
| Dimensions : | 39,8 x 12,9 x 303cm |
| Weight : | 8kg. |
Onkyo A-7055
1972
1974
Middle-of-the-road integrated amplifier from the early-to-mid-1970s, with all the necessary functions of the day : dubbing, low and high filters, frequency shifts for the NF-type bass and treble controls etc.
Also a fair leap upward in the specified specifications when compared to the earlier A-7050.
Healthiness inside gives full DC, pure complementary SEPP output, differential amplifier circuitry, a fair phono overload capacity, flat frequency response, 3-step phono input gain switch (-6dB / 0dB / +6dB) to fit most MM cartridges' output levels, ASO protection circuits which prevent blowing one of the two bipolar output transistors and pre/main loop to either use the A-7055 as power amp, as preamp, as both - or go 4-channel !
As the literature says : "Hearing is believing".
So the A-7055 and siblings were auditioned by musical experts, critics and amateurs (aren't we all ?) to refine the final circuit designs.
page online since : july 2008
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