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drdna wrote:

It is NOT that better tubes have no vibration. Instead, the tubes that sound best to me seem to have a sort of springy sound, like the sound of a water drop or the sound of the tabla drum being struck.

Interesting. My few period DHT tube all have this springy sound but they also has a long decay of rattling. It is like string attached under the bottom of the drum and when the drum sound dies away them strings continues to vibrate. The today Russian and Chinese tube has so such an effect at all. My YO186 has as well very strong and very long “dropped bicycle sound” when tapped. I am not accustomed to correlate this mechanic stress response to auditable effect for signal that flow via tube but I was under impression that this is very negative effect.

The only experience I had with listening tubes vibration was during the time I used a Lamm phonostage with high-gain tubes. I had a bunch of WE 417A pentodes and I did see a correlation between the signal microphoniks of the tubes and their response for bear ears after the tapping. I even was trying spectroscope during that time. However, if I discard the tendencies to microphonics then I did not see any coloration between shakeabilety and sound, in fact I remember that some of “microphonic tubes” had better sound then non-microphonics tubes.

I admit that I never made that observation with power tubes. I use 6C33C since 1995-96 and if I saw a tine that has any minute shakeabilety or the “dropped bicycle sound” I just trashed the tube, it was perhaps 2 tubes among around 50-70 that I went through. The 6C33C is very “dead” and response with no residual vibration at all. So, when I recently got engaged with DHT tine they kind of scare me with their aftershock response.. One of my 2A3 from 1943 when I shake it, it response like somebody forgot a handful of changed in the balloon. However, it sound what I drive a signal through is absolutely perfect. When I was complaining to my DHT people they told me that it is normal. I am not accustomed to it and if my IDHT 6C33C would behave like this I would not even plug it in.

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