On Sat, 05 Jul 2003 23:36:04 +0100, Chris Isbell
wrote:

I am currently working on changing the electrolytic capacitors in my
Quad 33/303 amplifier. After nearly thirty years of daily use, they
are probably at or beyond the end of their useful life.

[snip]

The new capacitors are in place and the 33/303 appears to be working
well and not producing any smells or strange noises (apart from some
of the weirder music I like :^). There was a concerning moment when I
thought there was a bass oscillation, but this turned out to be a
nearby petrol lawn mower! Many thanks for all the advice received.

Working on the amplifier has been instructive. Studying the circuit
and the construction reveals the care and attention to detail that
went into the original design. For example, all of the electrolytics
on the plug-in modules of the 33 are orientated with the +ve terminal
at the top, which makes servicing easier on boards with no silkscreen
component overlay.

The next job is to replace the connectors between the pre-amp and
power amp. These use 4-pin DIN plugs and sockets and, having failed to
find any reasonable alternative, I have obtained some lockable 4-pin
DIN connectors. Any suggestions for something better that will fit the
16mm(ish) DIN socket mounting holes would be welcome. (I've drawn a
blank so far.)


--
Chris Isbell
Southampton
UK