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In the Forum: Melquiades Amplifier
In the Thread: DHT driver & input
Post Subject: Are DHTs any good?Posted by be on: 3/4/2007
DHT amps can sound good or maybe charming is the right word, but I believe it is due to an error related to the concept of oops described elsewhere on this site.
This is the result of the filaments resonating and contributing with a sense of life and sparkle in the midrange and treble.
You can identify the sound quite easily by knocking on the tube when not playing, the sound you hear will be there in a subtle way, always! Making the music interesting and kind of stimulating for most people.
I built an enormeous 300B amp once and tried a lot of 300B tubes and they all had the same trait but tuned a bit differently.
It is also possible to elicit the voice of the tube by playing certain tunes, here strongly plucked electric guitars are well suited, and then stop the cd in the mibble of the sound, the tube will continue it for a while!
I tried to suspend the tube and dampen it, but it did not seem to help much, so the effect is posibly also due to electrostatic forces internaly.
All other DHTs I heard had the same problem or bonus.
I must add that I dont know if transmiting type of tubes also suffer from this problem, they operate the filaments on a much higher temperature, probably making them softer and less prone to resonate?
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