Hybrid preamps that use tubes for voltage gain and FETs to lower output impedance can sound very good, exhibiting some tube flavor combined with a direct sound (examples: Audio Research SP9, SP-11, Sonic Frontiers SFL-1 Signature).
factualpending
Speaker
Kevin DiehlEvidence Quote
“the original uh audio research sp9 was a pretty good one... yes they had some tube flavor they also had a very direct sound to them”
Source
What's More Important? Tube Preamp or Power Amp? Too Many Tubes? w/ Upscale Audio's Kevin Deal— Upscale Audio High FidelityCreated: 6/18/2026, 2:32:01 PM
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