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In Reply to: RE: Best sounding tubes for ARC SP-9 MK3 posted by audio perfection on June 21, 2020 at 18:16:55
Yes. Mine was purchased used as a MKII and shortly afterwards had factory updated to MKIII. It was a pretty significant upgrade - fixed the lean lower midrange tonal balance, improved transparency and dynamics.
My favorite was Amperex PQ 7308s.
I have a large collection of tubes but no 7308s.
I have owned the SP-9 MK1, Mk2, and MK3 in addition to the SP-14. The MK3 was the best.
They all seemed to require a couple of days warm up to sound at their best IMO.
I run the MK3 24/7 and change tubes after 7.5 months, since I use the system every day.
Tubes warm up faster than FETs. After all, these are tube/FET hybrids. This was true of a ARC D125 power amp I also have.
I am using the MK3 in my home theater setup with a Sovtek 6922 place holder in the phono section.
I know you prefer NOS but give a set of the 6922 Genalex Gold Lions a try. McShane can provide various tested noise levels.
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