Sensible Amplifier Modifications

Some of the amplifier models we are asked to service do not match up to today’s standards on safety and usability. For example; the vintage Quad II and Quad 22 amplifiers sound good together but the two pin mains connectors and voltage selector strips, let them down on electrical safety. There is an increasing shortage of vintage connectors and cables, so modifying these old units so they can accept LVD conformal plugs and sockets. makes a lot of sense. Quad 33 rear panel modification: We change the rear panel with a professionally manufactured, steel, powder coated,unit and replace the full set of DIN sockets and two pin mains connectors, with gold plated RCA connectors and IEC inlets and outlets., respectively. Quad 303 front panel modification: Similar to above. This includes an on-off switch, IEC fused mains inlet, L & R, gold plated RCA inputs and gold plated, 4mm, loudspeaker binding posts. Quad II modification. We change the 2 pin mains chassis plug to a fused IEC inlet and remove the rear fuse and blank off the non-LVD conformal mains voltage selector and preset it to 230/240V. We also add an RCA connector to allow use of a separate pre-amplifier but still allow the use of a Quad 22 if preferred. Quad 22 modification: Change the 2 pin mains connector to an earthed IEC inlet. Change the full set of short reach phono connectors to gold plated RCA connectors. Details and prices on the Servicing page. When you’re there, just click the underlined ‘service code’ of the repair you are interested in.