Home Audio AIWA (1976)

AIWA AX-7500 Amplifier Receiver

Updated 7 August 2021

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

AIWA AX-7500 Stereo Amplifier Revceiver

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.


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.


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


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.

«  previous ☖ contents next  »

More pages from the AIWA 1976 Catalog Index

AIWA AF-5080 Stereo Media Center

AF-5080 Stereo
Media Center

AIWA AD-6500 Cassette Decks

Cassette Deck

AIWA AD-1800 Cassette Decks

AIWA AD-1800
Cassette Deck

AIWA AD-1600 Cassette Decks

AIWA AD-1600
Cassette Deck

Information Note

Statements of performance were provided by the AIWA. The information provided on this page is translated from historical material and may not be accurate or accurately translated. This page is provided for entertainment purposes only.

More articles that you will like

Yahoo Groups closes on our digital heritage

Yahoo Groups closes
on our digital heritage

Pro-Ject Phono DS Box

Pro-Ject Phono DS
user experience

AudioPhil review of the AKAI SW-125 bookshelf loudspeaker

loudspeaker review

AKAI GX-630D reel to reel tape deck

reel to reel