A friend of mine, who is a tube seller in Germany, test the Herbie's tube dampers in his own designed microphonic tester. He recorded a max of 6dB of microphonic level being reduced on a E88CC tube with the Herbie dampers.
I couldn't tell the readings before and after using the Hal-Os. You may want to contact my friend (in Germany) if you're really interesed. He could be reach at info@audiotubes.de.
FYI he's a honest tube seller and he has to measure tubes, to grade the good tubes and to scrap those bad tubes. He measures tube parameters and microphonic. So I sent him 2 sets for measurement of microphonic reduction.
Tubes are microphonic in nature, try knocking anywhere near the tube socket.
Gnobber, Up /down, lose/tight - the magnitude of damping.
Motdathird,
Can a metallic clamp added on a tuning fork prevent the tuning fork from vibrating when being stroke? A metal clamp will only change the resonance frequency.
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