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PostPosted: 21 Feb 2017, 11:49 
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Joined: 21 Feb 2017, 11:44
Posts: 3
Rudistor RPX-33 is humming in one channel

Rudistor recommends : to "connect or disconnect the potentiometer".

Old amp so I dont want to spend a bunch nor ship to Italy

Can anyone recommend a good repair guy in the USA

THANKS!!!!


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PostPosted: 23 Feb 2017, 15:44 
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Joined: 05 Aug 2016, 14:35
Posts: 215
What, if any skills do you have? That looks like a quite simple device, and the symptoms you described are very likely due to (a) bad capacitor(s). As there is one board per channel, this makes sense.

I suggest that you remove the top and see if any of the capacitors (little black cans) are swollen, or look different one board as compared to the next. Let us know what you find. Do this while the device is unplugged, of course!


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PostPosted: 23 Feb 2017, 17:06 
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Joined: 23 Feb 2017, 02:02
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I'd suspect that the DC regulating capacitors gone bad, Try replacing them yourself if you know how to


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PostPosted: 24 Feb 2017, 14:51 
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Joined: 21 Feb 2017, 11:44
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Thanks for the reply

I am all thumbs and wouldn't trust myself to remove the cover.

Are there any reputable members who preform these services on the side?


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PostPosted: 24 Feb 2017, 15:17 
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Joined: 21 Feb 2017, 11:44
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I am in the USA NYC
Amp is in GA


Sold it to a member on head fi
It was working fine and was my only HP amp for 10 years until I upgradded

He said it came with a buzz in the left channel

It must have gotten damaged in transit even though I wrapped it in 2 feet of bubble wrap

Buzz goes away when Interconectors are removed ...

Buzz stays in left channel when swapping the right and left interconectors


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PostPosted: 25 Feb 2017, 08:23 
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Posts: 215
That 'sounds' like a cold-solder joint, or a problem with the input device.

First, try another input device.
Then, look carefully for a broken/loose/suspicious solder joint - with specific reference to the ground path.

I am in Pennsylvania, near Philadelphia. I do some small repairs - but only for those things that are brought to my door by the actual owner - who then watches the repairs and learns a bit of the process. As I do not do this for money, those are the conditions.


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