Pioneer A-9

1 9 8 1 1981
1 9 8 2 1982


Inside :
Non-Switching amp using the Vari-Bias circuit and high-speed RET -ring emitters transistors with a high fT- plus a huge toroidal transformer, two rows of shark-fins heatsinks and low-NFB amounts in coherence with the earlier Z1 series.

Vari-Bias consists of a high-speed servo which monitors input signals to feed the final transistors the necessary bias according to input level. The output transistors thus never switch off : no switching distortion.

Outside :
Lots of flashy lit dots, backlit pictograms and diagrams, tiny push-buttons and two rows of vertical LED meters which distinguished the Communication Components series.

By japanese standards, this wasn't high-end : just good feature-packed mid-end components.
Pioneer in Japan, as often there, didn't advertise for the A-9 or the CT-980 but for the A-780 and CT-780... which were not our A-7 and CT-7.

The export versions of most Communication Components were upped and export-only versions of the original japanese components : our A-9 is an upped A-980 and the japanese A-780 is somewhere between our A-7 and A-5. The export SX receivers didn't exist in Japan either.

The A-9 and A-980 are in fact completely different amplifiers, inside and outside : different trafo, different layout, different power boards, different functions... different everything ! See the A-980 page for the details.

Only the F-9 tuner and CT-9R recorder were identical on all markets : F-780 and CT-980.

The A-9 is a very healthy amplifier just the same, despite the oh-so-modern looks which probably turned down a few potential customers. It did turn me down back then, now I find it funny and naive enough to be desirable :-)

Apart from the colorful picto-graphs to designate sources which were found here and there until 1984, this radical design didn't set a trend at all.
Not even by Pioneer, for the next lineup was adorned with an oh-so-classic silver knobs layout as on the A-80.

Pioneer A-9, image 1 Pioneer A-9, image 2 Pioneer A-9, image 3
Pioneer A-9 specifications
Title Value
Power : 2x 110W (8 Ohm, 20Hz...20Khz, 0,003% THD)
2x 120W (8 Ohm, 1Khz, 0,003% THD)
2x 140W (8 Ohm, 1Khz, DIN, 0,003% THD)
THD : 0,003% maximum
IMD : 0,005% maximum
(0,003%@ 2x 55W)
Damping factor : 60 (20Hz...20Khz, 8 Ohm)
Power bandwidth : ??
Frequency response : 20Hz...20Khz (MM, RIAA, ±0,2dB)
5Hz...200Khz (0dB...-3dB)
Inputs : 1x Phono MM (2,5mV / 50kOhm /100 /200 /300 /400pF)
1x Phono MC (100µV / 100 Ohm / 33 Ohm)
1x AUX (150mV / 50kOhm)
2x Tape (150mV / 50kOhm)
Max. input level : 250mV (MM, 0,0015% THD, 1Khz)
10mV (MC, 0,0015% THD, 1Khz)
Outputs : 2x Tape rec. (150mV / 2,2kOhm)
2x speaker pairs (4...16 Ohm)
S/N ratio (input shorted, rated power) : 90dB (MM)
74dB (MC)
110dB (line)
S/N ratio (DIN, rated power to 50mW) : 80dB...68dB (MM)
75dB...70dB (MC)
90dB...70dB (line)
Filters : Subsonic (-12dB/oct below 15Hz)
Loudness (+6dB@100Hz, +3dB@10Khz)
Bass controls : ±10dB (100Hz) at 400Hz turnover
±10dB (50Hz) at 200Hz turnover
Treble controls : ±10dB (10Khz) at 2,5Khz turnover
±10dB (20Khz) at 5Khz turnover
Muting switch : -20dB
PC : 350W, 820W maximum
Dimensions : 42 x 15 x 44,3cm
Weight : 16kg.
List price : 89,800¥ (1981)
800$ (1981)
Pioneer A-9 : 0 topic
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page online since : january 2005
page updated : march 2010
page type : LGT / KNB
page weight : 209.62 Kb / 0 b

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