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I have my 100.2 humming (I mean hum comes out of the speakers).
I've already made many trouble-shooting tests and I'm sure it's due to the 100.2.
I've contacted ARC and they say it may be the filter caps in the amp's power supply.
Then I've contacted the local assistance (I live in Italy) and they told me that they obvioulsy have to see the amp to make a correct diagnosis (correct !) but if it's the filter caps it will cost more or less 400€ (more than 400$); don't remember if that includes VAT or not.
Before spending the money, I'd like to be sure (if possible) that replacing filter caps will solve the problem, so: do you have experiences in power amp hummin' ? Do you think there may be other causes (and remedies) than issues with power supply filter caps ?
What filter caps should I ask to be used to replace the original ones ? (I don't know if the original ones are still available).
thanks, ciao
daniele
Follow Ups:
My guess would be C45 through 52. 15,000uf 50 volt cap on a 50 volt line.That's not good practice.
Also C35 through 38. 2200uf 63 volt cap on a 60 volt line.
Also not good practice.
For that kind of money I think I would replace them myself with higher voltage (100 volt) parts.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 04/01/16
Disconnect the source from the inputs of the power amp and see if it still hums. I assume you've done that. Shorting plugs on the input as JB !mentioned is good but not a must.
ET
...into the RCA inputs. If the amp still produces hum thru the speakers, THEN it's the amp and (likely) nothing else
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Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."
Jeffrey,
I want to be sure I got it right: do you mean that I should take an RCA interconnect cable and connect one end to one RCA input of the amp, and the other end to the other RCA input, so that the two RCA inputs are "joined" by the interconnect cable ?No, reading again your message I think you meant I should take two RCA connectors (no cable in between) and "plug" the amp inputs, ain't it ?
OK, I'll try, but I'm quite sure it's the amp, as I've done many other tests, including that suggested by awe-d-o-file.
In synthesis, if I have only the power amp connected to the mains and to the speakers (no interconnects connected, no other component even connected to the mains), I hear hum.thanks
Edits: 04/01/16
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