Audio Database

The

Pioneer SA-9800
110,000yen(around the 1975 time)

Description
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The stereo Integrated Amplifier which inherited the design concept of SA-9900 and was developed.

The sub- termination scheme which has arranged the input/output terminal on the right-and-left panel like SA-9900 is adopted.
Thereby, the input terminal was completely united with the equalizer substrate, and has prevented the failure of the high region property under the influence of shielding wire etc.

The whole page hardwired-connection pure complimentary OCL circuitry which considered the output stage as the parallel push pull stream composition by one step of differential by }2 power source is used for a power amplifier part.
By constant-current-izing the load intensity of a pre driver, the large nakedness gain was taken and the distorted reduction covering a wide band is realized by applying optimal NFB. Moreover, the transitional crossover distortion at the time of a minute output is banished by using an output stage or before as a stabilizing supply. Furthermore, the linearity of a current characteristic improves by making an output stage into a parallel push pull, and distortion is suppressed.
Moreover, the differential amplifier and a bias compensation circuit are adopted for the improvement in stability, and the variation of offset voltage is suppressed to the exterior-temperature transition at the relative minimum.

While an equalizer part carries the differential amplifier by the low-noise transistor which carried out the can shielding in the first rank and aims at a stabilization of the output middle point, and the improvement in an SN ratio, the distorted reduction and the improvement in stability are aimed at by applying the direct current NFB 100%.
Furthermore, SEPP of the final stage could carry out the Class-A operation of the time of a large swing, and has taken out the high-output voltage by the low distortion.
Moreover, the tone-quality modification is aimed at by using the high precision element selected carefully for a using element.

Two Phono inputs are carried and the level adjustment up to -12dB and the four-point change of an input impedance are possible for one line of them.
Even -6dB is a transition of NFB and level adjustment serves as a transition of the output volume from -6dB to -12dB.

The tone circuitry has adopted the two-step hardwired-connection circuitry, is using FET for the first rank, and is suppressing the noise transition by a volume location few. Moreover, since NFB is applied to a two-step hardwired-connection circuitry also in direct current also in alternating current and it is sent out by a low-impedance in the tone circuitry of the following stage, they have been requirements ideal for work of a tone circuitry.
Furthermore, the stabilization of the middle point voltage is attained with the positive/negative 2 power-source scheme of }24V (total 48V).

The full-scale attenuator type volume of 22 contacts is adopted as a volume, and the gang error is reduced by using high precision printed resistance.
Moreover, the lever type attenuator of three steps is carried.

The NFB type is adopted as a tone control, and in order to extend a control range, the three-step change of a turnover frequency is adopted.
Moreover, the tone on/off switchpoint is carried.

To tapeses 1-2, the duplicate switchpoint in which tapes dubbing from 2 to 1 is possible is carried.

Two 18,000-micro F mass electrolytic capacitors are carried in the power-source part.

The low filter / high filter is carried.

The protection network with a built-in relay is carried, and the noise at the time of power-source on/off is also stopped.

The data which surveyed the product for every set is attached.

Internal
Block

Rating of a mode
Form Stereo Integrated Amplifier
<Power amplifier part>
Circuit system 1 step of differential whole page hardwired-connection parallel PP pure complimentary OCL
Effective output (both channel drive, 20Hz - 20kHz) 100W+100W (4ohm)
80W+80W (8ohm)
THD (20Hz - 20kHz) 0.1% or less (at the time of an effective output)
0.05% or less (at the time of 40W output 8ohm)
0.05% or less (at the time of 1W output 8ohm)
Cross modulation distortion 0.1% or less (at the time of an effective output)
0.05% or less (at the time of 40W output 8ohm)
0.05% or less (at the time of 1W output 8ohm)
Output bandwidth (IHF, both channel drive) 5Hz - 40kHz (0.1% of distortion)
Frequency characteristic 10Hz-80kHz+0 -1 dB
Input sensitivity/impedance Power amp in: 1V/50kohm
Output-terminal Speaker A-B: 4ohm-16ohm
Speaker A+B: 8ohm-16ohm
Headphone: 4ohm - 16ohm
Dumping factor (20Hz - 20kHz) 30 or more
S/N 100dB or more (IHF, A network, a short circuit)
<Preamplifier part>
Circuit system Equalizer amplifier: Positive/negative 2 power source,
differential three-step hardwired-connection Class-A SEPP per step
Control amplifier: Positive/negative 2 power source, first rank FET
Input sensitivity/impedance Phono1:2.5mV/50kohm
2:2.5-10mV of Phono / 35kohm, 50kohm, 70kohm, 100kohm
Tuner, Aux1, 2, Tape PB1, 2:150mV / 50kohm
Phono maximum permissible input
(0.1% of a THD, 1kHz)
Phono1:250mV
Phono2:250mV-500mV
An Output voltage/impedance Tape Rec1, 2:150mV
Pre out: 2V/1kohm
THD (20Hz - 20kHz) 0.05% or less
Frequency characteristic Phono(RIAA deflection): 30Hz-15kHz}0.2dB
Tuner, Aux, and Tape PB:7Hz-40kHz+0 -1 dB
Tone control
Bass: }10dB (25Hz/50 Hz/100Hz)
Turnover frequency: 100Hz/200 Hz/400Hz
Treble: }10dB (8kHz/16 kHz/32kHz)
Turnover frequency: 2kHz/4 kHz/eight kHz
Filter Low: 15Hz, 30Hz, 12dB / oct
High: 8kHz, 12kHz, 12dB / oct
Muting 0 -15dB-30dB
S/N (IHF, A network)
Short circuit
Phono: 70dB or more
Tuner, Aux, Tape PB: 90dB or more
<Synthesis>
The semiconductor used Transistor: 54 pieces
FET: Two pieces
Diode,others: 26 pieces
AC outlet Power-switch interlock: Two lines
Power-switch un-interlocking.: One line
Supply voltage AC100V, 50Hz/60Hz
Power consumption 190W (rate)
530W (maxima)
Dimensions Width 420x height 165x depth of 403mm
Weight 17.2kg