Interesting, JJ. I'm curious to your opinion.
I've tried the Emissions Labs 5U4G mesh and the Phillips 5R4GYS in the MW PS9.9 and liked both significantly over the OEM tube. The 5U4G offered noticeably deeper bass while the Phillips sounded slightly more even.
I got the Sophia's per Dan's recommendation...while good, I liked the PSVANE CV181 TII more and now I've been running Tung Sol 6F8G with a Woo Audio adapter. The TS sounded smoother but I felt the PSVANE had nicer high frequency definition. The Sophias were nice too but the others sounded more involving.
I tried Genalex Gold Lion 6922 in my Pathos Acoustics and hated them. The Siemens and Telefunken were so much better. Not sure how the rectifier tubes will be though.
Good luck!
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-Hedwig
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