Audio Database


Pioneer SX-434
50,000yen(1973 release)

The high cost performance receiver which supplied the state-of-the-art technology of those days to the tuner part and the Integrated-Amplifier part, and measured the improvement in a performance.

The two-step hardwired-connection type with exact RIAA deflection was used for the equalizer amplifier, and it has adopted the whole page hardwired-connection pure complimentary OCL scheme as a power amplifier part.

The tuner part serves as circuitry which adopted low noise FET and the triple variable condenser as FM front end and to which it adopted high-integrated IC and the ceramics filter as the IF section.
Moreover, FM muting switch which intercepts the unpleasant inter-office noise at the time of FM tuning is adopted.
A dial scale is a wide type and FM tick mark serves as a linear (regular intervals) scale.

It is also possible to sing by a mic mixing circuitry together with a record, a tapes, FM, and the special-NetWare-program source of AM broadcast.
The mixed signal is possible also for a sound recording on a tapes, and if the sound volume of the special-NetWare-program source is extracted to a min, it can be used also as mic amplifier.

The speaker termination is equipped with 2 sets, A and B. Moreover, it can use properly into four positions of A, B, A+B, and OFF by the change of a switchpoint.

Rating of a mode
Form FM / AM-stereo receiver
<FM tuner part>
Practical speed (IHF) 1.9 microvolts
Capture ratio (IHF) 1.5dB
Effective selectivity (IHF) 60dB
S/N 70dB
Image stonewalling ratio (82MHz) 60dB or more
IF stonewalling ratio (82MHz) 90dB or more
Spurious stonewalling ratio 75dB or more
AM supression ratio 50dB
THD mono: 0.2% or less
stereo: 0.4% or less
Frequency characteristic 20Hz - 15kHz, and +0.2 -2.0 dB
50Hz - 10kHz, and +0.2 -0.5 dB
Stereo separation 1kHz : 40dB or more
50Hz-10kHz : 30dB or more
Carrier leakage supression ratio 40dB
Antenna 300-ohm balance type,
75-ohm unbalance type
Muting ON-OFF
<AM tuner part>
Practical speed (IHF) 15 microvolts
Selectivity 35dB or more
S/N 50dB or more
Image stonewalling ratio 40dB or more
IF stonewalling ratio 50dB or more
Antenna Ferrite bar antenna
<Amplifier part>
Circuit system 1 step of differential whole page hardwired-connection pure complimentary OCL
Effective output
40Hz - 20000Hz, both channel drive : 15W+15W (4ohm)
15W+15W (8ohm)
1kHz, both channel drive : 18W+18W (4ohm)
16W+16W (8ohm)
1kHz, a one-side-channel drive 23W+23W (4ohm)
19W+19W (8ohm)
THD At the time of an effective output: 0.8% or less
At the time of 1W output: 0.1% or less
Cross modulation distortion At the time of an effective output: 0.8% or less
At the time of 1W output: 0.1% or less
Output bandwidth (IHF, both channel drive) 10Hz - 70000Hz (0.8% of distortion)
Dumping factor (1kHz, 8ohm) 25 or more
Remains noise (8 ohm, pre + power amplifier) 0.5mV or less
Input sensitivity/impedance Phono: 2.5mV / 50kohm
Phono maximum permissible input (rms/p-p): 100mV/280mV
MIC: 10mV / 60kohm
AUX: 150mV / 80kohm
TapePB: 150mV / 80kohm
TapePB(DIN termination): 150mV / 80kohm
An Output voltage/impedance Tape Rec:150mV
Tape Rec(DIN termination): 30mV / 80kohm
Speaker:A, B, A+B (4ohm-16ohm)
HeadPhone: 4-16ohms
Frequency characteristic Phono (RIAA deflection): 30Hz - 15000Hz, ±1dB
MIC, AUX, Tape PB: 30Hz - 25000Hz, ±1dB
Tone control Bass: +9dB, -8dB (100Hz)
Treble: +5dB, -7dB (10kHz)
Loudness contour +10dB(100Hz)
+ 5dB (10kHz, volume 40dB o'clock)
(An IHF short circuit, A network)
Phono: 70dB or more
MIC: 70dB or more
AUX, Tape PB: 90dB or more
Supply voltage AC100V, 50Hz/60Hz
Power dissipation 60W
Maximum electric power consumption 110W
Power receptacle Power-switch interlock 1. un-interlocking 2.
Dimensions Width 430x height 140x depth of 347mm
Weight 8.1kg