Onkyo P-309

Onkyo P-3090

Onkyo P-200

October   1 9 8 0 october 1980
1 9 8 3 1983

Very successful combo with a bit more detailed attention to looks than its previous siblings (P-306 / M-306 etc) and some circuit nifties to do between preamp and amp what others were doing between amp and loudspeakers.

So the P-309 has two pairs of outputs : a standard one (output 2) and one that is doubled between signal (L/R) and "servo sensor (L/R)". You guessed it : a special cable was to link the P-309 and M-509 to avoid resistance, capacitance or inductive elements added to the signal and make believe that preamp and amp were actually one and not two, distant, entities.

This was called W Servo Technology but however only did work with the M-509 with two dedicated Y cables with grounding cable.
This system was first used by Onkyo in the P-306 / M-506 (1978), P-306R / M-506R (1981), P-306RS / M-506RS (1983) and P-307 / M-507 (1978) - the M-507 being a very close version of the M-509.

The rest of the P-309 was just as seriously built :
Class A and DC everywhere, passive components for the tone controls, copper busses and shielding, regulations aplenty, non-magnetic metals, high Gm FET differential amplifiers for the relay-switched inputs (in a single aluminiumm casing) and low-impedance circuit and output.

The EQ phono stage was designed so that it would function like a power-amplifier, able to output the equivalent of a 5W signal !


Thank you Roman Schütz for having reminded me of two points :

1. The P-509 was an P-5090 in germany.

2. The P-5090 were also later on in Germany released under the P-200 name with different scripting and Integra badge added.
This was probably a way for Onkyo to get rid of its japanese stocks as the xx9 combo, in 1985/86, already was old salad, especially the P-309.

Onkyo P-309, image 1 Onkyo P-309, image 2 Onkyo P-309, image 3
Onkyo P-309 specifications
Title Value
Inputs : 130µV (MC low, with 100 or 300 Ohm load switch)
2,5mV (MC high, 100 Ohm load)
2,5mV (MM, with 47 or 100kOhm load switch)
150mV / 47kOhm (tuner, aux, tape in)
Outputs : 150mV / 2,2kOhm (tape out)
1,5V...13V (220 Ohm)
Maximum input level : 19mV (MC low, 1Khz, 0,05% THD)
380mV (MC high / MM, 1Khz, 0,05% THD)
Frequency response : 4Hz...150Khz (MC, +0,2 / -3dB)
1,8Hz...170Khz (MM, +0,2 / -3dB)
0,8Hz...170Khz (lines, +0,2 / -3dB)
THD : < 0,008% (MC, 3V output, 20Hz...20Khz)
< 0,002% (MM, 3V output, 20Hz...20Khz)
< 0,002% (lines, 3V output, 20Hz...20Khz)
S/N ratio : 70dB (MC, IHF-A)
88dB (MM, IHF-A)
100dB (lines, IHF-A)
Bass control : ± 8dB at 70Hz
Treble control : ± 8dB at 20Khz
High cut filter : 6dB / octave above 7Khz
EQ subsonic filter : 6dB / octave below 15Hz or 20Hz
Muting switch : -20dB
Semiconductors : 10x FETs
71x transistors
8x ICs
50x diodes
PC : 65W
Dimensions : 47,6 x 12,2 x 41,5cm
Weight : 10,5kg.
List price : 250,000¥
page online since : 2009
page updated : not yet
page type : LGT / KNB
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