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Levinson 390s -- intermittant loud cracking sound

I just picked up a new (used) 390s today. Sounds great, but every so often it emits a loud popping noise out of the speakers (seems to come from the right channel). Almost sounds like static-electricity discharge through the system. My understanding is the unit has low hours, original owner, and it hasn't been hooked up for quite awhile. Is this normal and just the unit re-charging capacitors, etc, so to speak? Or is this an indication of a problem? Thanks.
stevewetterling
coxhaus
231 posts
 
Is this the first balanced connection in your system? I have a 36S and one channel quit. The Mark Levinson service center put it back in top shape. They also replaced all the caps which I gather get old over time regardless of use. Mine now sounds great.
stevewetterling OP
5 posts
 
after much cable swapping to isolate the issue, I concluded it is indeed inside the 390 or the XLR connector on the back. returned the unit. thx.
dgarretson
2,595 posts
 
A loud transient can blow the fuses on the BAT 6C33C output tubes. However once those tubes experience that condition they may arc out repeatedly. After several such instances the tubes should be replaced.
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