Reviews/Comments

Preamp UltraSonic, our default recommendation for small-signal tubes, was introduced to our product lineup December, 2009.

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Rune Johansen, Sande, Norway

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"Greetings from Norway! I have received your tube dampers and I had never thought there would be such a difference. From I turned on my amplifier for the first time with the dampers – there was an improvement – No noise during startup. A 'black hole' is the best description. The same when I started to play – the sound is much more tight, with a black hole behind it. I'm really pleased with the dampers. So pleased that I wrote an email to my supplier and not only told him, but asked him to get them into his assortment. I’m going to buy a tube RIAA from him, but I must have it with Herbie’s dampers. Luckily I bought two spares with that in mind."

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"Just for your info I put the dampers on four Amperex Bugleboy from 1959 and 1963 in my Jolida JD502BRC from 2009."

Robert Browne, Santa Monica, California

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"Thanks for getting my recent order of tube dampers to me quickly. They arrived on December 24th, just in time to install them in my Audio Note L3 pre-amp for music listening over the Christmas holiday.
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"A pair of Preamp UltraSonic 9 dampers went on the Tung-Sol 5687 tubes, an UltraSonic Rx-9 damper went on a Mullard 6BM8 regulator tube and an UltraSonic Rx-30 damper went on a Bendix 5852 rectifier tube. Similar to my previous experience with your tube dampers there was increased focus and midrange clarity along with more bass detail and a subtle smoothing out of some lower treble grain. Everything became more coherent and this was especially noticeable on piano music. Without the dampers on, some recordings the lower notes were a bit muffled and occasionally there was some glare on certain higher notes. The most surprising change that I wasn't expecting was a quite noticeable increase in dynamics that contributed to the realistic and life-like presentation.
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"With these results on my pre-amp I'm going to have to order more tube dampers to use with my power amp. Thanks again for making products that have such a positive effect on the music listening experience."

Richard Kachur, Winnipeg, Canada

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"I really found that these made a big difference in my pre amp. I'd been using them and pulled them out the other day. Wow. Put them back in right away and made a note to purchase more to try in my power amp."

Wilson Yee, San Francisco, California

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"I'm really enjoying the preamp ultrasonic tube dampers - they really do bring out the best from my 6DJ8 tubes. They are better than the original ultrasonics that I have."

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