Linn Intek mysterious problem

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dragonweed

dragonweed

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Joined 2010
#1
I had a perfectly working Intek, which I did not need any more, so I gave it to my brother. He loved the sound very much, but after about two weeks when idling in his room, he heard a strong buzz from the speakers. By the time he jumped to turn it off, one of his woofers in his Sonus Faber Concertino was completely fried. It was not hot, no smell, just the strong buzz. After returning it to me, I checked every possible parts that may caused it (output transistors, drivers, resistors, p.s. voltages, idle current, DC offset, etc,) not the slightest problem was evident anywhere. I checked it with a scope and generator, with complex (capacitive and inductive) load, still no problem. I am a rather experienced service technician and DIY-er, but now I am completely puzzled. I welcome anyone with experience of this problem, because right now I have absolutely no idea what may have caused it. I have a schematic of the amp. (could it have been an AC surge?, I don't know....)
 
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#3
Oooops...... I've just tried that g.....mn mobile thing. I put the phone about 2 feet from the amp and called it from an other one. Bingo! Good to know, but what the heck I can do about it? The case of the Intek is made of rather thick iron sheet, plus it is connected to a (real) grounded AC socket. Should I build a military grade RF shielded container for it? Or just add some RF blocking parts in the signal/ supply path? Any ideas?
 
#4
Try another amp with the same connections in the same position before deciding what to do. I do know that most guys with RFI problems also tend to have long and poor quality leads - including speaker leads.

When you add that to unshielded sources like plastic cased media players, MP3 players, laptops, tablets etc. there can be a lot of RF prone wiring to protect or improve.
 
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