I'm inspecting and testing an HH Electronic power amplifier from 1995.

Schematics for the HH Electronic Mx 900: https://elektrotanya.com/hh_electronic_mx900-pwr-sch.pdf/download.html

TIME STAMPS: 0:00 Introduction 1:36 Connectors & Functionality 3:58 Cleaning the Unit 4:43 Inspecting the Electronics 10:26 Checking Fuses, Transistors & Diodes 18:05 Dim Bulb Tester 20:58 Testing Audio Inputs and Outputs 26:48 Setting the Bias 29:58 Thank you & Good night

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