A few years ago, my AW-100 developed an intermittent crackle in one channel that was annoying enough to be noticed, but infrequent enough to be really difficult to diagnose. I did the dry joint and freezing spray check. No luck.
I sent it to a technician who tried to get the service manual and lo and behold, EC stuck their Serial Numbers onto the amps with a paper sticker which has been lost to antiquity. The technician sent it back to me, and I have not had luck finding a matching schematic so far. I think this is a really early AW-100, based on the lack of PCB markings and the dried flux residue everywhere.
I was told to try replacing all the output stage Electrolytic Caps, which seem like low hanging fruit. But then I saw these mysterious components labelled: "1000 H" and "470 H". Does anyone know what are they, and if so are they worth restuffing?
I sent it to a technician who tried to get the service manual and lo and behold, EC stuck their Serial Numbers onto the amps with a paper sticker which has been lost to antiquity. The technician sent it back to me, and I have not had luck finding a matching schematic so far. I think this is a really early AW-100, based on the lack of PCB markings and the dried flux residue everywhere.
I was told to try replacing all the output stage Electrolytic Caps, which seem like low hanging fruit. But then I saw these mysterious components labelled: "1000 H" and "470 H". Does anyone know what are they, and if so are they worth restuffing?
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No need to replace these, but buy a chinese component tester for 10 dollars and check all elcaps.
3.5 years ago you solved the problem by resoldering all joints, did it show up again ?
I replaced some caps on a model AW 100 like this last week and it was fine. Check on
all boards.
I replaced some caps on a model AW 100 like this last week and it was fine. Check on
all boards.
Thanks! Polystyrene 1000pf caps... I learnt a new one today. Ordering electrolytics right now because there's only two 33uF elcaps per output stage. Might throw in a cheap Chinese tester as well. Will let everyone know how it goes - fingers crossed.
It went away initially but I haven't been using the amp since the "fix". Now the issue is back...