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AIWA AX-7500 Amplifier Receiver

Updated 31 March 2020

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The AWIA AX-7500 Amplifier Receiver is a lovely period amplifier with the standard AM/FM receiver built in. The front is finished in polished metal and is complimented by an array of knobs of varying sizes. The dominant feature is the large tuning knob, twin VU meters and the full width tuner frequency display. All the dials are circular and there is a single square power button protruding of the left of the face. The electronics are advertised as solid state.

AIWA AX-7500 Stereo Amplifier Receiver

AIWA AX-7500 Stereo Amplifier Revceiver

Performance

110 Watts of musical power (@4Ω) • Highly sensitive stereo tuner with PLL circuit • OCL = equal current (= capacitor) coupled, complementary power amplifier circuit with asymmetrical push-pull output stage (= SEPP) • Function selection buttons for two tape inputs with monitor circuit, magnetic phono input can be controlled up to 200mV, AUX, AM and FM • afc = FM tuning can be switched off, reception instrument and FM radio zero crossing instrument • muting = switchable FM-mute tuning • loudness = proper volume control, can be switched off • microphone mix controller • two speaker groups, can be switched off • Ironless power amplifiers with short-circuit protection and other up to date properties.

Amplifier

Music performance: 110W@4Ω; 90W@8Ω

Sinusoidal power (both channels controlled according to DIN45500 1kHz): 2x33W@4Ω; 2x30W@8Ω

Power range: at 0.2% distortion factor: 10Hz to 50kHz

THD: at nominal power: 0.2%

Frequency range: Phono RIAA equalized 30Hz-15kHz ±3dB; AUX, Tape 1+2 (DIN) 10Hz-70kHz ±3dB

Physical

Semiconductors: 1 IC, 44 diodes, 1 FET

Power supply: 120 Watt

Dimensions: 150(H) x 450(B) x 300(I)mm

Weight: 11kg

PLL circuit = FM sound decoder for optimal channel separation
The 19kHz pilot signal is compared in phase with the 38kHz switching signal. Hence the stability and excellent channel separation and low signal-to-noise ratio.

OCL circuit = capacitorless output circuit
A directly coupled, truly complementary power amplifier. Advantages: large bandwidth, dynamic range, low distortion. The equalizer or compensation amplifier is also designed as a directly coupled circuit

SEPP = Asymmetric push-pull circuit (single-end push-pull circuit)
The positive and negative pulses of the input signal are amplified separately in order to achieve an output power with a linear frequency range and low distortion.

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AIWA AX-7500 Amplifier Receiver

This was one of AIWA's most powerful amplifiers in 1976, producing an inspiring 110W musical power, rated at a more meaningfully quoted 30 watts (@ 8Ω) per channel. Although the MW radio receiver may not be that useful these days, it is the external inputs for an external turntable, tape input and auxiliary source that will be of most use to the modern collector. This amplifier unit will look impressively placed in a Danish-style teak shelving system.

Information Note

The information provided on this page is translated from historical material and may not be accurate or accurately translated. It is provided for entertainment purposes only.

AIWA 1976 Catalog Index

AIWA Hifi Catalog 1976

AIWA Hifi
Catalog 1976

AIWA AF-5080 Stereo Media Center

AF-5080 Stereo
Media Center

AIWA AD-6500 Cassette Decks

AD-6500
Cassette Deck

AIWA AD-1800 Cassette Decks

AIWA AD-1800
Cassette Deck

AIWA Mid-Tier Cassette Decks

Mid-Tier
Cassette Decks

AIWA Hifi Catalog 1976, Microphone section

Condensor & dynamic
Microphones

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