What is a quad 405 amplifier?

Answer 1

The Quad 405 is domestic HI FI power amplfier which was introduced around 1977 (or thereabouts )

It was rated at 100 watt/channel and was notible in its design as being a 'current dumping amplifier' which used a combination of feedback and feedforward to reduce distortion to very low levels

One of the benefits of the original design was no setting up on the work bench and nothing to drift over time,

The units proved very reliable and where always produced an honest sound

They could be bettered but have really stood the test of time - they are a classic

a mark 2 version came out in the 80's and this is the one to go for

I own three of them !

JJ