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In Reply to: RE: Is it possible to get Bass control with Tubes and A7 Speakers? posted by Monte Verdi on October 13, 2009 at 17:37:44
Big help - thanks!
"Soft" is unity damping (according to the specs I found through google) at 8 ohms, i.e. an 8 ohm output impedance. An SET on the 16 ohm tap would provide about that much damping. This high output impedance will increase the bass output at certain frequencies (where the speaker impedance is high) by several dB and would be quite an audible difference. You can try the Accuphase at different damping settings to confirm that this is an important parameter in your setup (or discover if it is not).
Most push-pull amps will be pentodes with feedback, and will have a much higher damping factor. There are a few with an adjustable damping control or switch - the Heathkit UA-1 comes to mind. And there are a very few push-pull triode amps with no feedback that would behave similarly to SETs in this respect.
Otherwise you may find a series resistor of up to 8 ohms is needed to get that kind of bass behavior - note this will raise the speaker impedance even higher.
Hope that helps!
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