The example shown opposite, although of the later grey
case issue, has DIN sockets and the old style green painted PCB.
Some early serial no.34s we receive for service
arrive in a very poor state. With the dreaded 'leaking capacitor' problem.
Several decades ago a bad batch of 100uF 6V electrolytics were inadvertently
fitted by the manufacturer. This particular capacitor brand contained a
faulty electrolyte (a corrosive liquid similar to that found in some
batteries). Over the years this nasty liquid seeps out of each
capacitor and onto the PCB motherboard causing track corrosion and shorting.
In the early Quad 34s there are over twenty of these capacitors fitted.
In the worst case, several tracks
will be rendered open circuit and the faults exhibited can be; no channel
select, intermittent popping & banging, intermittent channel operation, no
life, burning smell, the list goes on...
If we receive one of these unfortunate specimens we
will appraise the extent of the damage FOC and send the owner a detailed
report and service quotation.