Vintage Audio
this section covers some restoration work that I did on my vintage HI-FI gear
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Article #1 | 12:00 PM Sunday 02/10/2016

Sansui AU-7500: Introduction

I found this little gem in the local flea market. This was a lucky day.

When I plugged the AU-7500 amplifier and played a few audio tracks, I instantly recognized the authoritative sound of the AU-x500 series filling the room.

This will be a long process but I document it well. Maybe you find my work inspiring or helpful. Or my descendants, during a distant future maintenance, should this amplifier survive the years to come...

Article #2 | 12:46 PM Sunday 02/10/2016

Sansui AU-7500: Technical Data

This amplifier has the following technical characteristics.

Continuous RMS power (both channels)40 W + 40 W (8 Ω at 1,000 Hz)
Total Harmonic Distortion<0.1% (at rated output)
Intermodulation Distortion (70 Hz : 7,000 Hz = 4:1 SMPTE method)<0.1% (at rated output)
IHF power bandwidth (each channel driven at 8 Ω)5 Hz - 40,000 Hz
Frequency Response (at normal listening level)10 Hz - 30,000 Hz +0 dB / -1 dB
Load Impedance4 Ω - 16 Ω
Damping Factorapproximately 40 at 8 Ω load
SemiconductorsTransistors: 38 / Diodes: 15
Power Voltage100 V, 110 V, 117 V, 127 V, 220 V, 230 V, 240 V, 250 V at 50/60 Hz
Power Consumption100 W (max)
Dimensions / Weight140 mm (H), 440 mm (W), 322 mm (D) / 12.7 kg

Copyright © 1998- Alexandru Groza