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RE: Transformer mechanical noise

65.94.89.213

In Reply to: RE: Transformer mechanical noise posted by Ralph on July 24, 2024 at 12:43:34

Thanks again Ralph for the info.
Regarding the power transformer, not only are the screws tight, the previous modifications done 10 years ago included some kind of rubber padding to help reduce mechanical noise in the PT. I don't know what they did in the current modification (I don't think they did anything to the PT), but the buzz is now much reduced. So I assumed it was because of bypassing the power supply caps. As for the power supply caps, they were upgraded 10 years ago.
Regarding cutting the bypass caps, wouldn't that ruin them for future use? What if I liked the sound better with them in? They are about $30 each, seems wasteful to destroy them.
Question. Why would Rogue include bypassing the coupling caps in their upgrade package for the Stereo 90 if it is so bad to do so. That's why I did it in the first place.

Follow Ups:

DO NOT mess around with any portion of the power supply! - madisonears 18:50:28 07/24/24 (1)
Those power supply caps can hold a significant charge, possibly lethal! All you need to do is make contact with one positive terminal and any other metal part of the amplifier to possibly electrocute yourself or at least learn the lesson that electricity can hurt. The power supply bypass caps have nothing whatsoever to do with transformer hum and probably not much to do with the sound of the amp. Leave them be.

Despite your testimony to the contrary, I have a hard time understanding why anyone, trying to improve the sound, would bypass a quality capacitor (Mundorf SIO) with a lower quality cap. It just makes no sense at all, financially or technically. Maybe they don't really like the sound of the higher quality cap and want to mitigate its contribution. I would ask the tech.
berate is 8 and benign is 9
- RE: DO NOT mess around with any portion of the power supply! - mojul 02:12:31 07/25/24 (0)
  In my preamp I have recently changed/renewed the 1,0uF line coupling caps with Mundorf MCap Supreme Silver Gold Oil. After burn in (more than 300 hours) I have bypassed them with the Duelund JDM 0,01uF pure silver axial cap and I am very satisfied with the result.
  The Duelund JDM cap has dropped in price and they are now less expensive than before (USD 54 incl. VAT).
  
  You can read reviews about the Duelund's among many other brands at Humble Homemade HiFi. When a cheaper cap was needed in a lower quality speaker/amp or a higher quality cap in a high end speaker/amp I have used his reviews as a guideline. I think his reviews and gradings are very spot on.
  
  https://www.humblehomemadehifi.com/Cap.html
  
  mojul
Yeah - Ralph 14:14:46 07/24/24 (0)
If you can get them unsoldered that would be better. But again, if you're not comfortable knowing your way around the innards of the amp, take it to someone who does. Knock-on effects aren't worth the trouble!

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