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In Reply to: RE: Do any phono preamp manufacturers spec imd? posted by Triode_Kingdom on October 21, 2024 at 10:14:55
but Stereophile measurements for the phono stage peg the SP20 JFET hybrid at ~ -84 db (0.006%) with their test. Not as low as the line stage, but quite respectable considering it uses zero corrective feedback.
What do you want?
Follow Ups:
That's not very meaningful for purposes of this discussion. Unless you have a schematic, the topology of the phono stage is unknown, as are any remedial techniques that might have been applied by the manufacturer (such as feedback). Just as important, it's only one unit, and a statistical sampling from various manufacturers would be required to know whether FET-based preamps generally exhibit increased IM compared to other types. This one doesn't seem to, but again, we don't know for certain whether it qualifies under that description.I'll just add that it would be more assuring to see this specification published by the manufacturer, rather than an insulated third party with a vested interest in reporting good performance.
Edits: 10/25/24
That's not very meaningful for purposes of this discussion.
It demonstrates that JFETs can indeed produce good measured IMD results. Audio Research isn't exactly a newcomer to the world of excellent performance.
as are any remedial techniques that might have been applied by the manufacturer (such as feedback).
If you return to my first post, you'll find I've already answered that question.
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