In this Quad 405 repair example, after fault rectification, fitting a new
set of electrolytics on both
PCBs, and replacing a faulty class A transistor on the right channel, it is about to be
performance tested on dummy loads, prior to carrying out a listening test. It
will then be soak tested for several hours, followed by a Portable Appliance
safety Test. (PAT).
If your smoothing capacitors have deteriorated we will replace them with new
high quality Cornell Dubilier 'snap in' 10,000uF 63V 105 degree
capacitors. To orientate them correctly (lugs down), we add a bolt-on PCB.
(see the image above).
Alternatively at an additional cost of £30.00, (no audible performance gain) we
can fit Computer grade screw terminal types that fit in the same
orientation as the originals.
* What we call sensible modifications involves changing
certain components for higher performance types where a genuine improvement in
performance will be perceived. Where necessary we may also re-route
wires/cables. For example, we move the left & right Zobel network on
certain boards to the correct output earth plane.
On older 405s, for a nominal extra charge,
we can fit RCA (phono) sockets in parallel with the DIN socket and/or fit
professional loudspeaker binding posts in place of the push to connect types.
The extra charge for supplying and fitting 2 x gold plated phono sockets and 4 x
gold plated LS binding posts is £40.00 when included in a full service.