Herbie's vs. Hal-O's, Tube Dampers whats good?

I think CJ supplied the ACT 2 with the orange dampers on the 6H30's. Try the Reflector 6H30p DR a more extended, fuller more dynamic tube when I used them in the ACT 2, not cheap but worth it. If you don't like them resale is fairly easy without a big loss if any at all.

What I hear from the use of tube dampers is a slight reduction in high-frequency microphonic noise (vibration) from the tubes themselves. Sonically this comes across as a lessening of harmonics that might be perceived as 'air', 'tizz' or venue atmospherics at the very top of the frequency range. Its not music but rather amplified tube noise.

Dampening may, at first, seem to cause a loss of air surrounding an instrument - I sense this most pronouncedly on top-end strings - almost as the very top is cut off. Further listening reveals - to me anyway - a quieter presentation with a bit more musical information because actually there is less non-musical 'hash'.

I believe you can over-dampen with either too many dampers on a given tube or too many dampers overall. Here the result is a slight deadening or removal of top-end 'life' or sparkle.

I've used the CJ supplied dampers on the 6H30 in the ACT2 and the ARC dampers for the same tube in the Ref Phono 2. I'd stick with what the manufacturer provides - at least for the result they intend for their units. Otherwise, the Herbie dampers work very very well. In my Atma-Sphere MP1 I use them to good effect on two of the four 12AT7s in the phono section and on two of the five 6SN7s (per channel) in the linestage. That seems to strike the best balance between noise reduction and retaining a slight top-end liveliness.

I don't think dampers are a solution to increase warmth or the change tonal balance of a given piece of gear. Bottom line is: its easy to experiment, so let your ear be the guide to what sounds most realistic to you.
 

How are the new 6H30's working out? I was told the 1979 ones are the best and I can get a pair for $275. Do you know what year yours are?

Ultra-rx gives the best extension of both top and bottom.
I find that they work very well for power tubes as well. Worth every dollar spent. Sometimes u dont know the potential of the tubes you are using until you have tried a few of the herbie lab tube dampers.

Hey, one tube damper is cheaper than any exotic cables!

The orange ones are silicone O-rings. You can get a bag of 100 for like $8 at McMaster. They will work, but most people think they don't work as well as some of these more expensive ones. They can handle heat up to like 600 degrees, so they won't melt, and no residue. I bought a bag and gave to a friend to try on his Manley amp. He compared them and ended up tossing them out for Herbie's. I've not done too much comparison as I used them all. I used the O-rings in places where Herbie's are too bulky.

FrankC