This receiver has been featured in an article posted by Sound & Vision!
https://www.soundandvision.com/content/sansui-9090db-receiver-ages
This video is a complete overview the Sansui 9090DB Stereo Receiver, including general information, demonstrations, restoration outline, and bench testing.
00:00 Introduction
00:50 General Information
01:23 Model Comparison
03:39 Front Panel Control Review
09:46 Dolby Noise Reduction
18:07 Rear Panel Review
19:40 Inside Look
21:24 Restoration Review
31:15 Power Output Test
References:
Orion Audio Blue Book 2001
hifiengine.com