Pioneer SA-8800
¥ 58,500 (around 1975)
Commentary
This is a stereo pre-main amplifier with high cost performance such as control using FET and extra power.
The power amplifier section consists of a pure complimentary service OCL circuit directly connected to all stages of the first stage.
In addition, high-quality sound has been achieved by adopting a pair of transistors with uniform characteristics and a large radiator, and by using a pre-driver as a stabilized power source to eliminate transient crossover distortion at minute output.
In addition, to improve stability, ± 2 power supply by OCL circuit is adopted, and bias compensation circuit which always suppresses DC component leaking to output due to temperature change is installed.
The flat amplifier in the control section has an FET in the first stage, so that noise does not change depending on the volume position, and noise is suppressed at any volume position.
In addition, NFB is applied both AC and DC to the 2-stage direct-coupled flat amplifier, so that the distortion component can be minimized and low impedance can be fed to the tone circuit of the next stage, making the tone circuit work under more ideal conditions.
The control circuit also uses ± 2 power supply to suppress noise caused by switching.
The tone circuit uses a two stage turnover switch, which expands the range of tone control and allows for more ideal adjustment.
The equalizer uses a 3-stage direct-coupled amplifier with ± 2 power supplies and a low-noise transistor at the first stage. The gain of the first stage is large, a stable large amount of NFB is applied, and low distortion and high SN are realized.
In addition, the ± 2 power supply system eliminates the shock caused by switching.
Two tape decks can be connected. By turning on the duplicate switch, you can dub tapes 1 to 2 and 2 to 1.
A built-in protection circuit protects the speaker and amplifier itself from damage.
In addition, the built-in relay with two parallel circuits per channel eliminates click noise when the power is turned on or off.
Equipped with low / high filter, loudness contour and muting circuit.
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Model Rating
| Type | Stereo pre-main amplifier | ||||
| Power Amplifier Unit | |||||
| Circuit system | Pure complimentary service OCL | ||||
| Effective output (both channels driven, 20 Hz to 20 kHz) | 45W + 45W (4 Ω) 40W + 40W (8 Ω) |
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| Harmonic distortion factor (20 Hz to 20 kHz) | 0.1% or Less (Effective Output) 0.05% or Less (8 Ω at 20W output) 0.05% or Less (8 Ω at 1W output) |
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| Cross modulation distortion factor | 0.1% or Less (Effective Output) 0.05% or Less (8 Ω at 20W output) 0.05% or Less (8 Ω at 1W output) |
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| Output Bandwidth (IHF, both channel drives) | 5 Hz ~ 30 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 |
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| Damping factor (20 Hz to 20 kHz) | 25 or More (8 Ω) | ||||
| S/N (IHF, A-Network, short circuit) | 100 dB or more | ||||
| Preamplifier Section | |||||
| Circuit system | Equalizer amplifier : Two positive and negative power supplies, three stages connected directly Control amplifier : Positive and negative 2 power supply, first stage FET |
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| Input Sensitivity / Impedance | Phono1, 2 : 2.5mV/50k Ω Tuner, Aux, Tape PB1, 2, DIN : 150mV/50k Ω |
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| Phono maximum allowable input (harmonic distortion rate 0.1%) | 200mV(1kHz) | ||||
| Output Level / Impedance | Tape Rec1, 2 : 150 mv Tape Rec2 (Din) : 30mV/80k Ω Pre out : 1V/1k Ω |
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| Harmonic distortion factor (20 Hz to 20 kHz) | Not more than 0.05% | ||||
| Frequency characteristic | Phono (RIAA deviation) : 30 Hz to 15 kHz ± 0.3 dB Tuner, Aux, Tape PB : 10 Hz to 50 kHz + 0 -1dB |
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| Tone control |
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| Filter | Low : 30 Hz, 6dB/oct. High : 8 kHz, 6dB/oct. |
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| Loudness contour (Volume -40dB) | +8.5dB(100Hz) +4dB(10kHz) |
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| Muting | -20dB | ||||
| S/N (IHF, A-Network, short circuit) | Phono : 70 dB or more Tuner, Aux, Tape PB : 90 dB or higher |
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| <General> | |||||
| Semiconductor used | Transistor : 35 FET : 2 Diode, etc. : 21 |
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| AC outlet | Power switch interlock : 2 systems Power switch not linked : 1 system |
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| Power supply voltage | 100 VAC, 50Hz/60Hz | ||||
| Power consumption | 100W (Rated) 280W maximum |
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| External dimensions | Width 420x Height 150x Depth 345 mm | ||||
| Weight | 10.9kg | ||||