"spwyatt" wrote in message
oups.com...


** Groper alert !

I've just been lucky enough to have purchased a pair of the stunning
Rogers/BBC LS5/8 speakers, complete the with a pair of the BBC modified
Quad 405 frequency splitting amps (actually, one 405 and one 405-2...
no idea why!)

The main problem is that both amps exhibit a low level but perfectly
audiable mains hum - even with their gains right down and nothing
plugged into the (XLR) inputs. Am I right in thinking it's reasonably
easy to fix by changing some capacitors? Any help greatly appreciated!!



** The hum is almost certain to be a result of the internal modifications -
ie, it has been built in due to earth loops or magnetic field injection from
the mains transformer.

Likely very difficult to fix with the mods still in place.

Find a good service tech and let him have a look.




........ Phil