Amplificator vintage Pioneer sa8100

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Re: Amplificator vintage Pioneer sa8100

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The wide band, the stereo Integrated Amplifier which thought the output characteristics of the low distortion as important which adopted the positive/negative 2 power-source scheme as all the circuitries, and carries the differential amplifier in each section first rank.

The equalizer part serves as circuitry of the 3 steps of first rank differential-amplifier hardwired connection NFB by can shielding transistor 2 stone with few noise variations per hour, and low-noise transistor 2 stone.
Since the direct current NFB is applied 100%, direct-current stability of a differential-amplifier part is improving. Furthermore, high S/N and the low-distortion property have been acquired by adopting the element selected carefully.

In 30Hz - 15000Hz of RIAA deflection, the precision of ±0.2dB is realized by having adopted the nichrome vapor-deposition metal film resistor (1% of error), and the styrene capacitor (2% of error) as the NFB element of an equalizer, and the element which receives NFB.

Two circuitries are established for Phono and AUX in the input circuit, and the level control of Phono2 and AUX2 is possible to the straight input of Phono1 and AUX1.
When a high-output cartridge is used especially for Phono2 circuitry,It is considered that level is controllable without affecting an input impedance and a dynamic margin, and it is convenient when carrying out a compare audition, the mutual play using two cartridges with an output difference.

By a positive/negative 2 power-source scheme, an input point and an outputting point are always maintained near the zero potential, and the shocking noise by switchpoint change is decreasing sharply.

The control circuit of Bass and Treble is taken as the twin tone control further controllable by dividing into two, Main and Sub.
Main -- as for ±10dB and Treble, as for Bass, focusing on 1kHz, increase and decrease of a property of ±10dB are obtained at 10kHz by 100Hz.
±5dB and Treble are made at 50Hz, and, as for Sub, a control of ±5dB can do Bass at 20kHz.
Thereby, about 2000 kinds of tone properties can be built with controlling combining Main and Sub.

When carrying out usage which extracted volumes, such as night, and was crowded, it will adjust near the MIN point of volume control in few control ranges. In order to cancel such inconvenient, the level set organization is established.
Since a change can be possible for three steps of 0dB-15dB-30dB in this circuitry and the whole level can be attenuated as this label, it can always adjust in the good rotation span using near the center of a volume.

The control part has also adopted the differential amplifier for which the direct current NFB spends 100% to the first rank, and serves as three-step hardwired-connection NF type circuitry.
The can shielding transistor was adopted as the first rank, and the high robustness has been acquired also to the long-term variation per hour.

The tone-defeat switchpoint with which a flat property is acquired immediately is carried.

The Subsonic Filter of Low/High sharply cut by 12 dB/oct is built in.

The power circuitry has adopted the 1 step of differential pure complimentary OCL circuitry.
Furthermore, PNP and the NPN type which were chosen in the pair property are adopted as a driver and a power transistor.
Furthermore, by adoption of a large-sized radiator and current-limiting circuitry and an electronic protection network, it has taken all possible measures so that large power can fully be taken out.

The protection network which combined the electronic circuitry and the power relay is carried.

The audio muting switch is carried and a sound-volume down of -20dB is possible in an instant.

The speaker output-terminal which can be enjoyed by A, B, and A+B is carried.

Besides a pre-main splitting switchpoint when it carries out a separation, power amplifier is also abundantly equipped fully also with the attached circuitry, such as being put into a Subsonic Filter.

The material of the survey data is attached for every set.

Rating of a mode
Form Stereo Integrated Amplifier
Circuit system 1 step of differential whole page hardwired-connection pure complimentary OCL
Effective output
20Hz - 20000Hz, both channel drive : 40W+40W (8ohm)
45W+45W (4ohm)
1kHz, both channel drive : 44W+44W (8ohm)
50W+50W (4ohm)
1kHz, one-side-channel drive : 50W/50W (8ohm)
60W/60W (4ohm)
THD At the time of an effective output: 0.3% or less
At the time of 1W output: 0.05% or less
Cross modulation distortion At the time of an effective output: 0.3% or less
At the time of 1W output: 0.05% or less
Output bandwidth (IHF, both channel drive) 5Hz - 40kHz (0.3% of distortion)
Frequency characteristic 7Hz - 80kHz, and +0 -1 dB
Input sensitivity/impedance Power Amp In: 500mV / 50kohm
Output-terminal Speaker:A, B, A+B (4ohm-16ohm)
Head Phones: 4ohm - 16ohm
Dumping factor (1kHz, 8ohm) 60 or more
S/N (IHF, short circuit A network) 95dB or more
Remains noise (8 ohm, pre + power amplifier) Below 1mV (0.13 microwatt)
Subsonic Filter 8Hz(12dB/oct)
Circuit system Equalizer amplifier: 3 steps of first rank differentials hardwired-connection NF type
Control amplifier: 3 steps of first rank differentials hardwired-connection NF type
Input sensitivity/impedance Phono1:2.5mV/50kohm
2:2.5 mV - 5mV of Phono(es) / 50kohm
Phono maximum permissible input (rms/p-p): 250mV/700mV
MIC: 2.0mV / 50kohm
Tuner: 150mV / 100kohm
AUX2:150mV - 1.5V/50kohm - 100kohm
Tape Monitor1, 2:150mV / 100kohm
2 (DIN):150mV of Tape Monitor / 100kohm
An Output voltage/impedance Tape Rec1, 2:150mV
2 (DIN):30mV of Tape Rec / 80kohm
Pre Out: 2V/5 ohm
THD (20Hz - 20kHz) 0.05% or less
Frequency characteristic Phono (RIAA deflection): 30Hz - 15kHz, ±0.2dB
MIC: 10Hz - 10kHz, and +0 -1dB
Tuner, AUX, TapeMonitor: 10Hz - 70kHz, and +0 -1 dB
Tone control
Bass Main: ±10dB (100Hz)
Factice: ±5dB (50Hz)
Treble Main: ±10dB (10kHz)
Factice: ±5dB (20kHz)
Filter Subsonic:8Hz(12dB/oct)
Loudness contour (volume 40dB o'clock) +10dB(100Hz)
S/N (IHF, short circuit A network) Phono: 80dB or more
MIC: 70dB or more
Tuner, AUX, Tape Monitor: 90dB or more
Muting -20dB
Level set (three-step switching) 0dB-15dB-30dB
The semiconductor used Transistor: 49
Diode, others : 25
Supply voltage AC100V, 50Hz/60Hz
Power dissipation 105W
Maximum electric power consumption 260W
Power receptacle Power-switch interlock 1. Un-interlocking 2.
Dimensions Width 430x height 138x depth of 341mm
Weight 12.1kg

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