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Old 26th August 2009, 08:31 PM   #1
hostarn is offline hostarn  France
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Default NAD 3020 humming

Hej good folks!

I've got a problem with my NAD 3020. It's humming, loud enough to be inacceptable. It does'nt seem to be affected by the volume, its always the same.
Now, should I change the capacitors near the power-supply (as I've seen some say often cause the humming in these type machines) or has THIS something to do with it (please look at the picture). These capacitors seems to have been really hot at one time or another as the plastic cover is pealing of like a beuty-cream at the end of a fashion-show brawl.

What do you think?

Thanks alot in advance for your thoughts!

Erik
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Old 26th August 2009, 10:19 PM   #2
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does it hum with inputs shorted?
regards
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Old 27th August 2009, 01:22 AM   #3
hostarn is offline hostarn  France
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idunno

Will check tomorrow, how do I go about that?
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Old 27th August 2009, 01:29 AM   #4
Glowbug is offline Glowbug  United States
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Use an RCA plug, connect the ground to the center pin.
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Old 27th August 2009, 01:33 AM   #5
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Total Recap man , all of them. 25 years old , heavily used.
OS
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Old 27th August 2009, 03:48 AM   #6
hostarn is offline hostarn  France
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Thank you guys.

Total? as in ... all of them? Well, why not then. It's not expensive right? And it's accessible soldering right? Should I buy the same amounts or could you recommend some mods? Another thread perhaps?
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Old 27th August 2009, 04:51 AM   #7
taj is offline taj
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Those 2 that are melted... use high temperature rated ones there, maybe higher voltage rated ones too.

"...pealing of like a beuty-cream at the end of a fashion-show brawl."

Haha. I didn't know they had fashion show brawls. Is that the latest reality TV trend? Is the runway shaped like an octagon with a fence around it?

..Todd
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Old 27th August 2009, 05:04 AM   #8
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for the 3020 , not many caps on the amps ( 1 - 1000u @ 6.3 2 - 1u @ ??? input caps and the 47u@ 25v bootstrap).

I only have the amp schema (attached), but I'm sure the supply caps are
small. For the best caps , 20- 30 USD would be max.

Also , regrease the 2n3055/2955 OP's , bd139's (Vbe/driver).

Go up in voltage to the next level (example 47u@25v < 47u @35/50v)
Input caps can be higher grade poly NP 1uf's
OS
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Old 27th August 2009, 05:37 AM   #9
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also you may try another source except your pc he he he he

you may also like to read this vintage amplifier repair/upgrade manual

also your problem might be ""mechano""

meaning some contact is loose some ground is missing

regards sakis
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Old 28th August 2009, 09:38 PM   #10
hostarn is offline hostarn  France
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I changed those two caps that didn't look so good and now the amp is working like a charm.

Thanx alot airbody!
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