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In Reply to: RE: Audio Research SP9 MK2 posted by der451b@yahoo.com on December 24, 2008 at 10:20:29:
Most preamp manufacturers select output-cap values that are very large because they don't know what poweramp the preamp will be driving.
What's the value of the output cap's load resistor? (I asked about a schematic earlier but you've not responded.) That resistor and the poweramp's input-load resistor are in parallel. What's the resulting high-pass Filter Point with your poweramp? With tubed poweramps' high input impedances, the FP is often below 1Hz. One can end up with an output-cap value creating a FP of 1 - 2Hz with smaller-value caps if you know what poweramp the preamp is driving.
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Follow Ups
- der, now's the time to select the CORRECT-value output-coupling cap. - jeffreybehr 10:33:39 12/24/08 (2)
- RE: der, now's the time to select the CORRECT-value output-coupling cap. - der451b@yahoo.com 11:23:07 12/24/08 (1)
- RE: der, now's the time to select the CORRECT-value output-coupling cap. - jeffreybehr 10:06:47 12/25/08 (0)