Quad 405 restoration

Two units of the legendary Quad 405 amplifier are up for restoration. Both defective and miserable. I guess they have been used in some special setup and someone fitted XLR input and speaker connectors..

A paint job, and restoring the internals. All caps renewed. New speaker posts. The amplifier was upgraded with new low-noise op-amps. One unit had a defective transformer, it made a quite loud humming noise. A typical fault with these amplifiers, and many got changed on the warranty back in the day. I replaced it with a 300VA toroid.

A legendary amplifier, as seen here driving a pair of Revox BX-4100.

Though not original, the sating black finish, is beautiful.