"Brian Gaff" wrote in message
m...
My subwoofer picks up. Mobile phones, radar pulses, clicks and bangs on
the mains and occasionally short wave radio.
The very short speaker wires from amp to speaker in the box appear to be
the culprits for the higher frequencies, and the input leads the way in
for the rest, except
The mains borne crap.
It has a three core mains lead of the iec variety, but its only been
doing these things since it had a new bridge rectifier fitted a while
back. I am suspicious that some capacitors may have been damaged when the
bridge went down, but I'd have thought this would just result in hum.
The amp is built on pcbs maounted on the heatsink which effectively forms
the back of the cabinet beside the port.
Any ideas?
Brian
--
Brian Gaff -
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
I'll preface this by saying that it's hard to diagnose at long distance, but
by your description I would look at the following first:-
Assuming a conventional power supply, not switch-mode,
1) Any mains filtering before the mains transformer may have been damaged by
excessive current due to the rectifier failure
2) Any high frequency filtering i.e. small capacitors across the rectifier
and/or smoothing capacitors may have been damaged by excessive voltage due
to rectifier failure.
3) Check also the main reservoir capacitors as they too may have been
damaged, but I agree that hum is the more likely result of damage there.
Good luck.
S.
Interference on sub woofer amps
Threaded Mode
