SONY TAN-8250

Commentary

A high-end stereo power amplifier developed with the aim of faithful waveform transmission.

The A-class stage has a 3-stage differential amplifier configuration, and the first stage has a dual FET with two high input impedance FETs in one package. This circuit has a DC amplifier configuration to improve phase characteristics.

The B-class stage consists of a Triple Darlington driver stage, a triple push-pull stage and a pure complimentary service stage.
Double epitaxial type PNP and NPN pair power transistors are used for this part.

It is equipped with a peak program meter of optical indication system with good tracking ability even for a pulsed waveform.

It is equipped with a protective circuit. The protective circuit of the power transistor uses a load impedance detection type protective circuit with a current limiter using an electronic circuit with extremely fast response, and a heat detection type protective circuit that detects the temperature rise of the heat sink.
In addition, the protective circuit of the speaker is a pure electronic type and operates reliably against generation of DC voltage.

The power supply section uses a combination of a toroidal core transformer, a thyristor controlled rectifier circuit, and an electrolytic capacitor for two power supplies.

A power limiter switch is provided to prevent damage to the speakers due to excessive output.
Output can be switched in 4 stages.

Parallel or series connection provides almost twice the output power of stereo for low impedance loads of 2 Ω or higher and high impedance loads of 8 Ω or higher.

Equipped with a subsonic filter to prevent ultra low-frequency noise caused by the warpage of a phonograph record.
When the normal / test switch is set to normal, the filter is turned on.

Equipped with 2 input terminals and Route 3 output terminals.
Among the output terminals, terminal A is fixed and terminal B is level-adjustable. The output terminal of the other system is a direct output terminal, which is useful when you are concerned about the damping factor deterioration.

Model Rating

Type	Stereo power amplifier
Circuit system	Phase linear DC-amplifier configuration pure complimentary service circuit
Amplifier Unit
Output	1 kHz (both channel operation) : 250W + 250W (4 Ω) 180W + 180W (8 Ω) 20 Hz to 20 kHz (both channel operation) : 200W + 200W (4 Ω) 150W + 150W (8 Ω) 20 Hz to 20 kHz (single-channel operation) : 300W (4 Ω, Para Connection) 500W (8 Ω, series connection)
Harmonic distortion factor	0.1% or Less (at Rated Output)
Cross modulation distortion factor	0.1% or Less (at Rated Output)
Frequency characteristics (8 Ω load, 1W output)	Test : DC ~ 100 kHz + 0 -1dB Normal : 20 Hz to 100 kHz + 0 -3dB
Damping factor (1 kHz)	250 or More (8 Ω, Speaker Direct Terminal)
Input Sensitivity / Impedance	1V/50k Ω
Power limiter	Rated Output, 1/2, 1/4, 1/8
Meter Part
Frequency characteristic	30 Hz ~ 30 kHz + 0 -3dB
Meter indication range	0W ~ 200W
<General>
Semiconductor used	Transistor : 63 Dual FET : 2 units Diode : 64 units SCR : 2
Pwer	100 VAC, 50Hz/60Hz
Power outlet	Power switch not linked : 1 system, 200W
Power consumption	380W
External dimensions	Width 440x Height 170x Depth 410 mm
Weight	23.3kg