JVC JP-S7

October   1 9 7 5 october 1975
1 9 7 7 1977

Rare preamplifier adorned with very interesting looks which may make it look like a 1970s gadget. Said looks survived, in simplified form, until the A-X9 in 1981.

Of course, the Victor JP-S7 isn't a gadget - at 170,000¥ in 1975, it wasn't meant to be.
The accompanying power amplifier, JM-S7, was equipped with NEC's V-FET and cost the near-TC-880-2 sum of 230,000¥ - high-end indeed.

Visually striking is the volume slider which is more technical than it may seem : it hides four gangs, two at the buffer output and two at the input for reduction of residual noise and better linearity at low listening levels.

Among the many features, the phono stage is MOS-FET charged and operates in Class A.

JVC JP-S7, image 1 JVC JP-S7, image 2 JVC JP-S7, image 3
JVC JP-S7 specifications
Title Value
Phono 1 / 2 / 3 inputs : 2mV / 33kOhm, 47kOhm, 100kOhm selectable
100pF, 330pF selectable (phono inputs 2 & 3 with level pot)
Tuner input : 200mV / 70kOhm
Auxiliary 1 / 2 inputs : 200mV / 70kOhm (with level pot)
Tape 1 / 2 inputs : 200mV / 50kOhm
Max. input : 350mV (Phono 1/2/3, 1Khz, RMS)
35V (tuner, aux)
PRE outputs 1 / 2 : 1V / 4KOhm (output #2 with level pot)
Tape output 1 : 200mV / 80kOhm (RCA)
Tape output 2 : 200mV / 70kOhm (DIN)
THD : 0,05% (1Khz, 5V output)
0,02% (1Khz, 1V output)
S/N ratio : 63dB (phono, RMS)
75dB (phono, IHF-A)
86dB (lines, RMS)
96dB (lines, IHF-A)
Frequency response : 15Hz...100Khz (+0 / -1dB ; lines)
20Hz...20Khz (±0,3dB, RIAA)
SEA frequencies : 32 / 63 / 125 / 250 / 500Hz
1 / 2 / 4 / 8 / 16Khz (selectable between 12 / 16 / 20Khz)
Defeat circuits : SEA defeat switch
14dB inter-stage amplification defeat switch
Loudness : +8dB at 100Hz & +4dB at 10Khz (vol. -30dB)
Muting : -20dB
Subsonic filter : 12dB/octave at 18Hz
High filter : -6dB/octave at 9Khz
Headphones : suitable for 8...200 Ohm
Componentry : 102 transistors
28 diodes
4 ICs
AC outlets : 2x switched
2x unswitched
Dimensions : 57,8 x 16,25 x 26,8cm
Weight : 8,7kg.
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