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

Pioneer M-22

The die-cast aluminum radiator, die-cast chassis employing class A stereo power amplifiers.

The streamer A class action is adopted. A class operation and is shed every idle current when no signal is still a lot of transistors, the method uses only transistors operating range with good linearity. A work-class power utilization is low, but increasing the amount of heat, the two push-pull output transistors are synthesized and amplified to obtain the same waveform and bottom, B strain and the switching amplifier is not salmon crossover distortion does not occur.

M-22 to A-level circuit is run, NFB removed the DC circuit capacitor amplifier configuration, the DC by the time constant of the formation of the loop without NFB, a flat phase characteristics were obtained through ultra-low, stable NFB operation are obtained. This A-class operation and streamer configurations DC amplifier,i realized the middle and high range and excellent bass response without distortion sense.

The M-22 was a pure Class A amplifier that was rated at 30 watts per channel. Pioneer stated in its Series 20 brochure: "Class-A circuits are used throughout to reduce distortion. If operated in Class-B the M-22 would deliver no less than 150 watts per channel--five times as much--with so-so distortion. The most sophisticated circuit construction yet developed by Series Twenty is reflected here, along with truly first-class parts and components to asssure you're getting the real advantages of such design."

Like the C-21 Preamplifier, the M-22 used metallized polyester capacitors and nichrome-vaporized, metal-coated resistors. Pioneer utilized a dual mono circuit design and component layout, with a massive power transformer for each channel, coupled with two equally large 22,000 microfarad electrolytic capacitors per channel. The left and right channel circuitry was mounted to large die-cast finned aluminum heatsinks. All this was mounted to a rigid die-cast aluminum chassis.

What was striking about both the M-22 and M-25 amplifiers was, of course, their appearance. Practically all amplifiers in the late 1970s and early 1980s were fully enclosed by sheetmetal on all sides, with a ventiated cover. Pioneer took the minimalist approach, indeed, a purely industrial design approach to the design of these amplifiers. All the key components were visible, with the left and right channel components grouped in a mirror image. This really appealed to audiophiles who truly are intrigued by the "innards" of their electronic components.


Integrated systems: Two-stage differential, PPdrive, two-stage Darlington, parallel PP. Net complementary OCL (A-class operation, DC amplifier configurtion)

Effective output (both ch driven): 30 W + 30 W (10 Hz - 30 kHz, 8Ω)

Harmonic distortion (10 Hz - 30 kHz, 8Ω):

RMS output: 0,01%,

15 W output: 0,005%,

1 W output: 0,005%

Intermodulation distortion (50 Hz: 7 kHz=4:1,8 Ω):

RMS output: 0,005%,

15 W output: 0,003%,

1 W output: 0,003%

Output bandwidth (IHF, both ch driven): 5 Hz - 100 kHz (strain rate of 0,01%)

Frequency: 2 Hz - 150 kHz +0 -1 dB(1W output)

Input: 1V / 50kohms

Output speakers: 8 ohms

Damping Factor: 60 (20 Hz - 20 kHz, 8 ohms)

SN ratio (IHF, A network) Short circuit: 106 dB

Semiconductor: Transistor: 44 pieces, Diode, other: 62 piece

Power supply: 100V - 220V, 50Hz/60Hz

Power consumption: 10W

Dimensions (W x H x D): 420 x 158 x 370mm

Weight: 22 kg

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