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Hum!!

My Jolida 102 has been great for 10-20 years.   Recently, about every hour, the thing bursts out with a loud, VERY loud base-like HUM (both channels and subwoofer).  I flip it off, then on, and it's fine.  Then about an hour or two later, same thing ...

Is this worth fixing?  Troubleshooting?  Any place in LA area you would recommend?
128x128jadane
stereo5's avatar
stereo5
6,269 posts
 

@noromance 

I think you mean cold solder joint.

mribob
229 posts
 
George Meyer, A/V repair expert, located near Santa Monica, or west side, they moved recently. Very good, very reliable 

Good luck,
Bob
randy-11
1,913 posts
 
call them quick

if it is the power supply caps, they may blow and wipe out the entire amp, maybe some drivers too...
simao's avatar
simao
1,746 posts
 
@stereo5
+1 for wit
wolf_garcia
6,631 posts
 
Here’s a lovely story for post holiday enjoyment: A hum appeared in both my subs, which are RELs connected to a single ended amp (Inspire Fire Bottle HO) with Canare wire attached to largish spades to combine the cables…works great. I take the cables apart at the spades and re-do them, look at the Neutrik plugs at the subs, tighten everything, check all the AC cables for grounding issues…basically take the whole gear heap apart…still humming…low frequency just going on and on...go through the amp tubes (there are only 4 on this amp so no big deal)…KT88s swapped out for others, 6SN7GTB swapped for its backup…no change...I get to the rectifier, a 4 month old Gold Lion GZ34 and BINGO! Swap it for a 274B I had in reserve and the hum disappeared. The end.
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