Onkyo A-7

October   1 9 7 6 october 1976
Circa
1 9 7 8 c.1978

Healthy and powerful 1970s.

The A-7 is powered by a 4,8kg power transformer and 2x 25,000µF caps.
The driver stages are a p-p Class A design while output is Class B.

Low-resistance copper grounding tracks to limit the influence of dynamic transmodulation, keep internal impedance low and stereo separation high.

The phono section is a low-noise differential input with Class A p-p, allowing linearity and high input level - 230mV at 1Khz.
And all the usual functions : bass & treble controls with two turnover frequencies each, subsonic & high filters, tape dubbing both ways, stepped attenuator and tone controls etc.
No DC circuit, though, and no deported input/speaker selectors - lots of wiring.
So the A-7 is simple, healthy, powerful and will last forever.

Designed to be housed in a bigga wood enclosure (therefore much better looking) but said enclosure is... Invisibilia ; It seems the bigger A-10 was export-only.

Onkyo A-7, image 1 Onkyo A-7, image 2 Onkyo A-7, image 3
Onkyo A-7 specifications
Title Value
MAIN section MAIN section
Dynamic output : 260W
Output : 2x 80W (4 Ohm ; 1Khz ; 0,1% THD)
2x 68W (8 Ohm ; 1Khz ; 0,1% THD)
2x 70W (4 Ohm ; 20Hz...20Khz)
2x 65W (8 Ohm ; 20Hz...20Khz)
THD : 0,1% (rated power)
0,08% (1W output)
TIM : 0,1% (rated power)
0,08% (1W output)
Damping factor : 50 (8 Ohm)
Power bandwidth : 2Hz...80Khz (± 1dB)
Square-wave tilt : < 5% at 50Hz
S/N ratio : 110dB
Input : 1,5V / 100,000 Ohm
Output load : 4...16 Ohm
PRE section PRE section
Inputs : 2,5mV / 50kOhm (phono 1 & 2)
150mV / 50kOhm (tuner, aux & tape)
THD : 0,05% (rated power)
TIM : 0,08% (rated power)
Frequency response : 30Hz...15Khz (± 0,2dB ; phono 1 & 2)
15Hz...40Khz (+0 / -1dB ; lines)
Maximum input : 230mV (1Khz ; 0,1% THD ; phono1 & 2)
S/N ratio : 80dB (IHF-A ; phono 1 & 2)
90dB (IHF-A ; lines)
Tape output : 1,5V / 2700 Ohm
Bass control : ± 10dB @ 100Hz
Treble control : ± 10dB @ 10Khz
Bass turnover : 400Hz or 125Hz
Treble turnover : 8Khz or 2Khz
Subsonic filter : 10Hz
High filter : 5Khz
Loudness switch : +5dB at 100Hz and 10Khz
Muting switch : -20dB
General General
Componentry : 46 transistors
16 diodes
4 ICs
Dimensions : 44,4 x 15,9 x 38cm
Weight : 14kg.
Onkyo A-7 : 0 topic
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page online since : august 2010
page updated : august 2010
page type : LGT / KNB
page weight : 178.27 Kb / 0 b

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