85.3.60.144
In Reply to: RE: Tube preamp with Bel Canto S300?? posted by rebbi on November 05, 2009 at 08:00:41
..so I guess I can comment.
1/ 10k is a silly low value for a poweramp input impedance and will limit your choice of preamps. I see no advantage of such a low value - none.
2/ A preamp should have an output impedance less than 1/10 the load of the following poweramp, which means it should be 1k or less, and most present day preaamps will be in that area. Our preamps have figures closer to 100 ohms, but the Audible Illusions range are around or even above 1k. CJ and ARC would all be comfortably below 1k.
3/ 99.9% of tube preamps have an output coupling cap, and in conjuction with a low input impedance poweramp this can lead to bass end roll off. Designer's chioces vary, but you'd need to listen to the expected match to be sure of compatibility.
This is the only real problem in matching a tube pre to a 10k input impedance poweramp, and the simple cure is to increase the size of the output coupling cap x5 or so.
Regards, Allen
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