Bose Amplifier Repairs

Bose 1800 Series 2

Bose 1800 Mk II

This was buzzing and also burning the 0 V return to chassis, fault was the toroidal transformer for the RH channel is too close to the chassis and was shorting the secondary winding to the case causing the 0 V return to burn up. Next time it was switched on the solder on the connector to the smoothing caps for the other channel vaporised, had to change both pairs of capacitors as they were faulty. The capacitors were Rifa 100 V 10,000 µF and are possibly past their change by date!