Technics SU-8044K amplifier

Technics presents an amp which, while not the absolute highest in power, has plenty of punch especislly for the majority of people who listen to music at less than full power from their amps anyway. And we haven't neglected waveform fidelity, which means that this amp will amplify the input signal while adding or subtracting little or nothing from the waveforms of the original music. So you'll get distortion-free amplificationover a wide and flat frequency range. Plus these great operating conveniences; FL meters to replace conventional output meters, a versatile recording selector, a stable, rugged power supply and advanced NF-type tone controls. The list of features and specs will give you the facts and figures. But the real test of this amp is in the listening.

DC Power Amplifier Helps Preserve Waveform  Fidelity

Waveformfidelity has been greatly enhanced in Technics SU-8044K by the elimination of coupling capacitors not only in the signal path but also in the NFB loop.

The lack of something is offen a defect. But here the absence of capacitors means gain all the way down to 0hz and phase linearity in the bass frequencies. The result, in this DC power amplifier, is waveform fidelity - the accurate reproduction of musical waveforms.

Advanced Power Dynamic Sound

The SU-8044K offers plenty of power for dynamic sound, and superior waveform fidelity. Here are some of the circuit features that make it possible; a single-packaged, low-noise dual transistor is used in the differential amplifier first stage for low noise and precise thermal tracking. Current-mirror loading provides high open loop gain, without increasing the level of noise. This output assisted by the emiter follower, drives the voltage amplifiaction stage (Class A) with minimal distortion especially in the high frequency range. A 2-stage Darlington connection is used in the power stage, all adding up to plenty of power and insignificant distortion.

Super Quiet Phono Equalizer

The SU-8044K has an unbelievably high Signal-to-Noise ratio of 80 dB (at 2,5 mV sens. IHF A) when using an MM type cartridge, a spec rarely found in this amp's price class. It means that noise won't interfere with your enjoyment of records, evn during very soft passages. There is a 3-stage direct coupling MM phono equalizer section with direct coupling of the PNP-NPN transistors, plus a PNP transistor in the emitter-follower. A few of the reasons for low distortion and high gain are the separation of DC and AC in the negative feedback loop of the equalizer, 100% DC feedback and the use of narrow tolerance components for negative feedback.

Treble and bass Controls

An advanced operational IC is used for the negative feedback-type tone controls. Bass and treble can be easily boosted or attenuated to suit individual tastes without introducing distortion.

Accurate peak-Power Indication

The easy-to-read FL (fluorescent) meters are an improvement over conventional peak power indicators because of their near-instantaneous response and superior accuracy. They can be switched between two ranges: 0,1W - 100W, a range that is useful when metering for full peak power: 0,01 W - 10 W, the range at which most listening is usually done.

Versatile  Recording Selector

The SU-8044K has two tape positions on the input selector as well as on the recording selector in a logical and practical layout. With this complete separation, you can do such things as dub from tape to tape while listening to your favorite disc. Or tape from your tuner while listening to music on another tape.

Rugged Stable power Supply

The power supply is designed to handle the sudden current demands of high energy musical transients without losing sound clarity or introducing transient crosstalk. This is done by using two large capacity 8,200 µF electrolytic capacitors in the bridged, full-wave rectifier circuit and by employing a recently-developed transformer. It also supplies regulated voltage to the phono equalizer circuit. The transformer coils are floated in a special resin to absorb unwanted vibrations. Even at low volume levels you can enjoy your favorite music without being bothered by a noisy transformer.

Other Features

Muting circuit eliminates shock noise when the power is turned on and off, providing added speaker protection.

High filter to cut out high frequency noise such as record scratches and tape hiss.

Loudness switch for use when lisstening at low volume levels. Lows and highs are boosted to make up for "deficiencies" in the way the human ear responds at low volume levels.

Front-panel speaker selector lets you select either of two speaker systems (A or B) boith or at onec (A + B)

Specifications

Amplifier Section (IHF)

Continuous Power both Channel Driven

From 20 Hz - 20 kHz

2 x 40 W  at 4 Ω

2 x 38 W at 8 Ω

From 40 Hz - 16 kHz

2 x 40 W at 4 Ω

2 x 38 W at 8 Ω

At 1 kHz

2 x 46 W at 4 Ω

2 x 40 W at 8 Ω

Total Harmonic Distortion:

Rated Power (20 Hz to 20 kHz)

0,03% at 4 Ω

0,02% at 8 Ω

Rated Power (40 Hz - 16 kHz)

0,03% at 4 Ω

0,02% at 8 Ω

Rated Power (1 kHz)

0,03% at 4 Ω

 0,02% at 8 Ω

Half Power (1 kHz) :   0,015% (8 Ω)

Half Power (20 Hz - 20 kHz) :  0,08% (8 Ω)

-26 dB Power (1 kHz) :  0,15% (4 Ω)

50 mW Power (1 kHz) :  0,2% (4 Ω)

Intermodulation Distortion:

Rated Power (250 Hz : 8 kHz = 4 : 1 ) :  0,03%

Rated Power (60 Hz  : 7 kHz = 4 : 1 SMPTE 8 Ω) :  0,02%

Power Bandwidth( both channel driven -3 dB): 

At 4 Ω :  5 Hz - 30 kHz

At 8 Ω :  5 Hz - 50 kHz

Residual Hum and Noise:  0,8 mV (0,6 mV, IHF  A)

Damping Factor:  16 (4 Ω);  32 (8 Ω)

Headphones Output Level/Impedance:  400 mV/330 Ω

Load Impedance

Main or Remote:  4 Ω - 16 Ω

Main and Remote:  8 Ω - 16 Ω

Input Sensitivity/Impedance

Phono :  2,5 mV/47 k Ω

Tuner, Aux :  150 mV/47 k Ω

Tape 1, Rec/Play :  180 mV/33 k Ω

Tape 2 :  150 mV/33 k Ω

Phono Max.input Voltage (1 kHz RMS):  150 mV

Signal-to-Noise Ratio

Rated Power (4 Ω)

Phono :  73 dB (80 dB IHF A)

Tuner, Aux, Tape :  86 dB (97 dB, IHF A)

-26 dB Power (4 Ω)

Phono :  62 dB

Tuner, Aux, Tape :  63 dB

50 mW Power (4 Ω)

Phono :  58 dB

Tuner. Aux, tape :  60 dB

Frequency Response;

Phono :  30 Hz - 15 kHz (RIAA standard curve ±0,8 dB)

Tuner, Aux, Tape :  10 Hz - 50 kHz (-1 dB) ±0,5 dB (20 Hz - 20 kHz)

Tone Controls

Bass :  50 Hz +10 dB /-10 dB

Treble ;  20 kHz +10 dB / -10 dB

High Filter:  7 kHz, -6 dB/oct

Loudness Control (Volume at -30 dB):  50 Hz , +9 dB

Output Voltage/Impedance

Rec Out :  150 mV

Rec /Play :  30 mV/82 k Ω

Channel Balance

Aux (250 Hz - 6300 Hz) ±1 dB

Channel Separation

Aux (1 kHz) 58 dB

General

Power Consumption: 400 W

Power Supply:  AC 110/120/220/240 V 50/60 Hz

Dimensions (W x H x D):  430 x 142 x 255 mm 916-15/16" x 5-19/32" x 10-1/32")

Weight:  6,7 kg (14,8 lb)