Thunderchild
New Member
We have a Quad 303 power amp. its been in the loft a few years (and possibly misused by interfering tenants). at present it won't work.
problem is severe mains hum and very little sound. the unit consists of a heaty metal case containg a very large transformer a rectifier 4 1000uF 100V condensers, 4 beafy power transistors, 2 preamp circuits and one unidentified circuit (see picture) my guess is its a power regulator for the preamps. This circuit has some burning on it.
any ideas of the possible problem ? we assumed the smoothing condensers were shot but they look ok.
problem is severe mains hum and very little sound. the unit consists of a heaty metal case containg a very large transformer a rectifier 4 1000uF 100V condensers, 4 beafy power transistors, 2 preamp circuits and one unidentified circuit (see picture) my guess is its a power regulator for the preamps. This circuit has some burning on it.
any ideas of the possible problem ? we assumed the smoothing condensers were shot but they look ok.