Sony ST-P7J

Sony Precise 7J

October   1 9 7 8 october 1978
1 9 8 1 1981

From the Precise P7 system and as cute as the other two !
Despite the looky-looky design, the square-ish counter-balancing of the TA-P7F, the ST-P7J offers all any modern mid-end Sony tuner offered within a more standard enclosure :

Quartz X'Tal Locking in 0,1MHz steps,
Varactor / Mos-Fet tuning,
Dual-Fet balanced mixer,
Uni-Phase IF filters,
memory IC with 8 presets,

Plus, of course, feather-touch controls and slot-in cards for memorized stations.

Like the ST-A7B the export version is FM-only and the japanese original AM+FM so there's a supplementary button on the latter

The ST-P7J is essentially an ST-J60 with some coming from the ST-A6B bestseller - definitely not low-end and better than most mid-end equivalents - PRECISE !


Detailed views and measurements of the JP original here.

Sony ST-P7J, image 1 Sony ST-P7J, image 2 Sony ST-P7J, image 3
Sony ST-P7J specifications
Title Value
Quieting sensitivity : 10.3 dBf (1,8µV ; 30dB, mono)
16,1 dBf (3,5µV ; 50dB, mono)
37.3 dBf (40µV ; 50dB, stereo)
S/N ratio : 77dB (mono)
72dB (stereo)
THD : 0,06% (100Hz, mono)
0,06% (1Khz, mono)
0,06% (10Khz, mono)
0,08% (100Hz, stereo)
0,08% (1Hz, stereo)
0,015% (10Khz, stereo)
IMD : 0,06% (mono)
0,08% (stereo)
Alt. channel selectivity : 85dB (400Hz)
Capture ratio : 1,0dB
Frequency response : 30Hz...15Khz (+0,2 / -0,5dB)
Stereo separation : 48dB (100Hz)
50dB (1Khz)
45dB (10Khz)
AM suppression : 60dB
Image rejection : 85dB
Spurious response ratio : 100dB
Subcarrier response ratio : 70dB
IF response ratio : 95dB
RF intermodulation : 70dB
Componentry : 16 ICs / 3 FETs / 16 LEDs
32 transistors / 42 diodes
PC : 13W
Dimensions : 21,5 x 7,5 x 33cm
Weight : 3,6kg.
List price : 65,800¥
Sony ST-P7J : 0 topic
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page online since : may 2007
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