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You've stumbled on the dirty little secret of High Efficiency speakers...hum!.

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In Reply to: RE: Amplifier for AA Uno Nano ? posted by aaron1608 on March 17, 2016 at 17:25:50

Any little tube rush or hum that you'd never heard on a typical system sounds like a jet engine and as soon as you notice it, it's all that you hear.

It's tough to say what will work for you. Often, I have to float the grounds which is more of a ground loop buzz. Or change tubes. That said, my Wavelength Geminis are as close to dead quiet as you can easily get. Another 300B amp worked great on a 95db speaker, but hummed like a banshee on my horns.

Still, to an extent, when you get into the 105db range in speakers, you will hear any buzz or hum if you try. A slight hum that you only hear with your head next to the speaker is likely the best that you'll get. Perfection will be elusive, IMO.

Just keep trying and returning candidates.

-Rod

Follow Ups:

RE: You've stumbled on the dirty little secret of High Efficiency speakers...hum!. - aaron1608 18:24:28 03/17/16 (4)
"Just keep trying and returning candidates."
Unfortunate in Toronto,Canada dealers don't have in stock many SET's nor to let me listen in my system.
Hence my asking for A direction.
- RE: You've stumbled on the dirty little secret of High Efficiency speakers...hum!. - GEO 17:04:05 03/18/16 (1)
  Have you tried first watt SIT?
  - RE: You've stumbled on the dirty little secret of High Efficiency speakers...hum!. - aaron1608 17:05:37 03/18/16 (0)
    No,not yet.I am still SET guy at my heart. :-)
- RE: You've stumbled on the dirty little secret of High Efficiency speakers...hum!. - Rod M 19:31:04 03/17/16 (1)
  Yeah, I know the problem.
  
  Unfortunately, many of the better SETs are expensive and specs don't really help. And there are plenty of variables, a noisy tube or as Chip mentioned, a poor match with the preamp.
  
  I was fighting some hum for months and finally replaced all my preamp tubes and then had to swap 6922s a few times to get the right mix. Beware that any recommendation might not work for you.
  
  How does the system sound with your old amp or a SS amp? Is it quiet?
  
  -Rod
  - RE: You've stumbled on the dirty little secret of High Efficiency speakers...hum!. - aaron1608 17:13:51 03/18/16 (0)
    I sold my japanese 2A3 and have no amp now. It was perfect with Coincident 95db but not anymore at 105db.

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