What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Teac AS-M30

Stereo Integrated Amplifier

For years Teac has been justifiably recognized as a world leader in tape recording and playback equipment. Teac tape decks provide total performance, not only in reliable, high stability tape transport mechanisms, but also in ultra low distortion amplification circuitry.
This advanced signal processing technology has been fully incorporated in our new line of stereo integrated amplifiers. They offer great sound and versatility with plenty of useful (not excess) power, and important, functional features – not just fancy frills.
Teac amps really give you your money's worth.
 Designed for high performance and smooth power, the AS-M30 is perfect for the audio enthusist who knows and wants good sound. The kind ofmusic fan who doesn't feel the need for one of today's astronomically – priced amplifiers with needlessly high power output (and consumption).
The latest technology has been combined with an all-new look at circuit configuration and features, resulting in vastly improved reliability plus lower distortion over the entire frequency and power range.
The AS-M30 is a trend-setting answer to what an integrated amplifier should be.

All-Stage Direct-Coupled OCL Power Amplifier
The power amplifier section includes a differential input stage, assuring minimum noise and distortion throughout the entire power range, and an OCL (Output Capacitor-Less) output stage for improved low frequency response and damping. All stages are direct coupled, meaning that the signal path is free from waveform-distorting coupling components. This assures accurate signal transmission – from first stage to output.
 Low Noise Integrated Phono EQ Amplifier
A differential first stage with current mirror circuitry achieves high sensitivity and wide dynamic range with minimal distortion in the equalizer amplifier. The usual problems with inferiors signal-to-noise ratio in low-level preamplifier circuits have been solved by the use of PNP-type semiconductors in the first stage. The result is smooth, undistorted phono reproduction with nothing but total silence in the background.
For improved reliability and long-term stability, the entire EQ amp section has been incorporated in an integrated circuit.

Bipolar Power Supply
Amplifier power supplies are often a source of crosstalk and intermodulation distortion. The AS-M30 however, incorporates a bipolar power supply with a massive transformer and large 4,700 μF capacitors to assure maximum stability and minimum distortion even at the highest output levels. There's plenty of power to spare for the most dynamically challenging passages.

Unique Tone Control Configuration
The AS-M30 tone control circuitry is fully incorporated into the power amplifier negative feedback loop, eliminating the usual additional stage of amplification. This not only contributes to circuit economy, but also means extra low-distortion tone control.

41-Position Detent Volume Control
A large, easy-to-handle volume control knob permits accurate setting of listening levels with a minimum of fuss. Its 41 detent positions are ideal for reference level location, and they make it easy to reset desired volume levels.

Connections for Two Independent Tape Decks
Connect two reel-to-reel and a cassette deck for maximum recording flexibility. A tape copy switch is also provided; you can dub recordings from either deck to the other by simply flipping a switch. This eliminates the time-consuming fuss of Having to reconect tape deck leads every time you want to copy a tape.

Speaker Selector Switch
This important feature lets you use two sets of stereo speakers with convenient switching from the front panel. You can select set A, set B or sets A and B simultaneously. Set up all four speakers in one room for an „all-round” sound, or place one set in another room for an expanded listening environment.
The speaker selector switch also has an Off position which mutes both sets of speakers, but keeps the headphone jack active – convenient for late-night listening via headphons.

Loudness Control
At low listening levels, the sensitivity of the human ear to low high frequencies decreases. Music tends to lack presence and sound „dull”.
To compensate for this, the AS-M30 incorporates a loudness control which boosts the lows and highs in accordance with the ear's frequency loss curve.
This means that you hear all your music in the proper perspective even at low volume.
Continuous Reted Power: 30 W per channel (20-20,000 Hz, 8 ohms, no more than 0,1% THD, both channel driven)
Total Harmonic Distortion:
No more than 0,1% at rated power
No more than 0,05% at 1 W/1 kHz
Input Sensitivity/ Impedance:
Phono : 2,5 mV/47 k Ω
Tuner : 150 mV/47 k Ω
Tape 1, 2 : 150 mV/47 k Ω
Phono Maximum Input Level: 150 mV
Output Level/Impedance:
Tape 1, 2 : 150 mV/47 k Ω
Headphones : 8 Ω
Speaker : Off, A, B, A + B / 8 Ω or more
Frequency Response: 20 – 20,000 Hz +0 -1dB
Tone Control:
Bass : ±9 dB at 100 Hz
Treble : ±9 dB at 10 kHz
Loudness Control: -8 dB at 100 Hz; +4 dB at 10 kHz
Signal-to-Noise Ratio:
Phono : 70 dB
Tuner, Aux, Tape : 90 dB
Power Requirement: 100/117/220/240 V AC 50/60 Hz
Power Consumption: 115 W at rated power output (13W at no signal)
Dimensions (W x H x D): 410 x 145 x 290 mm (16-1/8” x 5-11/16” x 11-7/16”)
Weight: 7 kg (15 lbs 6 oz) Net

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