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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: Why Passive Preamp? posted by adjieda on October 5, 2011 at 19:15:24:
IMO, less active stages equals lower harmonic distortion and lower harmonic distortion equals better sound.If you can't turn your volume control up all the way, then you have too much gain in your system.
If you have 'one whole gain stage worth' too much gain, why not get rid of one stage?
Resistive passive preamps can be a problem. If the impedance is low enough to not cause problems driving cable capacitance plus the Miller capacitance of your power amps input tube, it might be a problem for the source to drive.
(too high an output impedance and those capacitance's will cause a loss of high frequencies. Too low an input impedance to the passive attenuator and the last stage of you source (phono preamp) might not be happy driving it)
I use an Autoformer Volume Control that allows me to ditch the active line stage and retain low output impedance to drive the capacitance of the cable and Miller.
With an AVC or TVC the output impedance is never higher than the source driving it. As you turn the volume down the output impedance goes down while the reflected impedance of what you're driving goes up.
This makes life "good" for the final stage of your source.Check out Dave Slagle's website and forum for more information.
Tre'
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"Still Working the Problem"
Edits: 10/05/11
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- RE: Why Passive Preamp? - Tre' 21:03:06 10/05/11 (0)
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