Repair case # 879655. 03/06/2025 Krell KAV-3250 amplifier . No sound on one channel.
Nice amplifier. Massive power transformer, has 3 separate independent audio modules containing preamp, driver and output section. Nice technical design, detailed components work. All modules are interchangeable. European school schematic design and idea, strong casing , good outlook , powerful amp. Minuses – use SMD capacitors in hard working schematic like this is not perfect idea. Modules develops lots of heat and destroying those capacitors fast. After 5 years they all are waste.
Troubleshooting – found shorted output transistors (6) , cracked soldering joints on board ( output transistor legs) , all 6 SMD capacitors are dead.
Unit returned to life after re-soldering cracked joints, 2 fuses , 6 transistors, 6 capacitors SMD.