Are you using them on all 10 tubes or just select positions? I have replaced the tubes with all vintage Teles & Siemens. Just trying to take the unit to the next level.
If so, what brand have you tried. These look interesting: http://www.thetubestore.com/dc-19-22mm.html
I use Hal-O's on my Aesthetix IO and noticed a worthwhile improvement, I would imagine the Rhea would benefit as well. I feel they are worth the money.
I'm using ARC tube dampers in my Rhea. I started out only using them on some of the tubes, but now have them on all. Seems to have made for a bit more definition.
One thing to be aware of - some of the tubes are pretty close together. Unless they are very thin, solid dampers may be a problem.
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