Onkyo A-7055

1 9 7 2 1972
1 9 7 4 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.

Onkyo A-7055, image 1 Onkyo A-7055, image 2
Onkyo A-7055 specifications
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.
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page online since : july 2008
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