Musical Fidelity Amplifier Repairs
Musical Fidelity A1
They were designed by Tim de Paravicini and create a huge amount of heat even though they are only rated at 20 Watts per channel.
The above pictures are from a Swedish Mk I with a 2 piece top heat-sink. It is in very good condition internally considering it reaches 50-60°C!
The Mk II (below) has perforated side plates. If I used one regularly then I would remove the side plates to provide ventilation through the internals of the amplifier when powered up. This one also had a one piece top\heat-sink. The switches needed cleaning and a capacitor needed replacing, thankfully Musical Fidelity decided to use 105°C caps in this and later versions so it hadn't dried them all out. An output transistor was faulty in one of the amps, they are 2N3055\2955 complementary pairs.