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In the Forum: Melquiades Amplifier
In the Thread: Why the tubes shall be the same?
Post Subject: Dht and harmonicsPosted by drdna on: 5/23/2009
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 Romy the Cat wrote:
I afraid it might be some vibrant harmonic discrepancies between the single-stage high Mu IDHT and DC-coupled DHT, or some kind ULF wobbling of my DC-coupled solution. I think it is something more fine then frequency response, as the sound generally is quite good but the  it feels that something is keep drifting in music while is plays. It is not firm and sound is not locked firmly in its presentation manner.
Well, I experienced the same exact phenomena with using different 2A3 tubes as you remember, which I do believe has to do with the mechanical harmonics in part.  At some point it would be interesting to explore the possibility of removing tube dampers or adjsting them to see the effect.
I still think it is worthwhile to see the frequency distribution, or ideally make a waterfall graph to see the decay of harmonics between the sides just to see if there is a difference.  At least if it is identical, it narrows down the possibilities.
Adrian

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