Мечтаният от всеки аудиофил Pioneer SA-9800 Integrated Amplifier Vintage Classic → Обява 38892664

The beautiful Pioneer SA-9800 integrated amplifier is a classic in terms of styling and performance.

A stereo pre-main amplifier developed by inheriting the design philosophy of SA-9900.

Like SA-9900, it adopts a side terminal system in which input / output terminals are arranged on the left and right panels.

As a result, the input terminal is completely integrated with the equalizer board to prevent degradation of the high-frequency characteristics caused by the shielding wire.

The power amplifier section uses a pure complimentary service OCL circuit directly connected to all stages. It consists of a single stage differential with ± 2 power supplies and a parallel push-pull configuration.

By making the load of the pre-driver constant current, the bare gain is increased, and by applying the optimum NFB, the distortion is reduced over a wide band. By using the power supply before the output stage as a stabilizing power supply, the transient crossover distortion at minute outputs is eliminated. By using the parallel push-pull output stage, the linearity of current characteristics is improved and distortion is reduced.

In addition, a differential amplifier and a bias compensation circuit are adopted to improve stability, so that fluctuation of offset voltage due to external temperature change is minimized.

The equalizer is equipped with a differential amplifier using a low-noise transistor can-shielded at the first stage to stabilize the output mid-point and improve the SN ratio. In addition, 100% DC NFB is applied to reduce distortion and improve stability.

In addition, the final stage SEPP operates in class A operation until large amplitude, enabling high output voltage to be extracted at a low distortion rate.

In addition, carefully selected high-precision elements are used to improve sound quality.

TypeStereo pre-main amplifier

Power Amplifier Unit

Circuit system

Differential 1-stage all stages directly connected parallel PP pure complimentary service OCL

Effective output (both channels driven, 20 Hz to 20 kHz)

100W + 100W (4 Ω)

80W + 80W (8 Ω)

Harmonic distortion factor (20 Hz to 20 kHz)

0.1% or Less (Effective Output)

0.05% or Less (8 Ω at 40W Output)

0.05% or Less (8 Ω at 1W output)

Cross modulation distortion factor

0.1% or Less (Effective Output)

0.05% or Less (8 Ω at 40W Output)

0.05% or Less (8 Ω at 1W output)

Output Bandwidth (IHF, both channel drives)

5 Hz ~ 40 kHz (Distortion Factor 0.1%)

Frequency characteristic

10 Hz to 80 kHz + 0 -1dB

Input Sensitivity / Impedance

Power amp in : 1V/50k Ω

Output terminal

Speaker A / B : 4 Ω ~ 16 Ω

Speaker A + B : 8 Ω ~ 16 Ω

Headphone : 4 Ω ~ 16 Ω

Damping factor (20 Hz to 20 kHz)

30 or more

S/N

100 dB or more (IHF, A-network, short circuit)

Preamplifier Section

Circuit system

Equalizer amplifier : A class SEPP with 2 positive and negative power supplies, one stage differential and three stage direct connection

Control amplifier : Positive and negative 2 power supply, first stage FET

Input Sensitivity / Impedance

Phono1 : 2.5mV/50k Ω

Phono2 : 2.5 to 10mV/35k Ω, 50k Ω, 70k Ω, 100k Ω

Tuner, Aux1, 2, Tape PB1, 2 : 150mV/50k Ω

Phono maximum allowable input

(Harmonic distortion rate 0.1%, 1 kHz)

Phono1:250mV

Phono2 : 250 mV to 500 mV

Output Level / Impedance

Tape Rec1, 2 : 150 mv

Pre-out : 2V/1k Ω

Harmonic distortion factor (20 Hz to 20 kHz)

Not more than 0.05%

Frequency characteristic

Phono (RIAA deviation) : 30 Hz to 15 kHz ± 0.2 dB

Tuner, Aux, Tape PB : 7 7 hz to 40 khz + 0 to 1 db

Tone control

Bass:

± 10 dB (25Hz/50Hz/100Hz)

Turnover Frequency : 100Hz/200Hz/400Hz

Treble:

± 10 db (8kHz/16kHz/32kHz)

Turnover Frequency : 2kHz/4kHz/8kHz

Filter

Low : 15 Hz, 30 Hz, 12dB/oct.

High : 8 kHz, 12 kHz, 12dB/oct.

Muting

0, -15dB, -30dB

S/N (IHF, A-network

Short circuit)

Phono : 70 dB or more

Tuner, Aux, Tape PB : 90 dB or higher

Semiconductor used

Transistor : 54 Nos.

FET : 2 Nos.

Diode, etc. : 26 pcs

AC outlet

Power switch interlock : 2 systems

Power switch not linked : 1 system

Power supply voltage

100 VAC, 50Hz/60Hz

Power consumption

190W (rated)

530W maximum

External dimensions

Width 420x Height 165x Depth 403 mm

Weight

17.2kg

There are two Phono inputs, one of which is capable of level adjustment up to -12dB and 4-point switching of input impedance.

For level adjustment, NFB changes up to -6dB, and output volume changes from -6dB to -12dB.

The tone circuit is a 2-stage direct-coupled circuit. By using FET in the first stage, noise variation due to volume position is minimized. In addition, NFB is applied to the 2-stage direct-coupled circuit in both AC and DC, and is sent to the tone circuit in the next stage with low impedance, making it an ideal condition for tone circuit operation.

In addition, the voltage at the midpoint is stabilized by two power supply systems, plus and minus 24 v (total 48 v).

The volume uses a full-scale attenuator type volume with 22 contacts, and the use of high-precision printing resistors reduces gang errors.

It also has a 3-step lever type attenuator.

NFB type tone control is adopted, and 3-step turnover frequency switching is adopted to expand the control range.

It is also equipped with a tone on/off switch.

It is equipped with a duplicate switch that can dub tapes 1 to 2 and 2 to 1.

The power supply section is equipped with two large electrolytic capacitors of 18,000 μ F.

Equipped with low filter / high filter.

A protective circuit with a built-in relay is mounted to suppress noise when power is turned on/off.

The actual measurement data of each product is attached.

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