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We would recommend Sophia Electric Aqua 274B rigid plate tube for 300B amplifiers
and SNR above 135dB
Blumenstein's most ambitious full-range design
Sophia Electric™ 274B tube is a premium rectifier tube for 5U4/5R4/5AR4* direct replacement with 3X longer plate structure
and analog RCA inputs
STAX SR-X9000 Electrostatic Energizer We would recommend Sophia ElectricSTAX's current flagship earspeaker and the most technically advanced electrostatic headphone the company has ever produced, the SR X9000 features third generation MLER 3 electrode technology for a level of resolution and purity that surpasses even the legendary SR 009S. Type and Technology Over ear, open back, electrostatic. MLER 3 (Multi Layer Electrode Generation 3) fixed electrode, STAX's most precise electrode technology to date. Pro bias (5 pin)
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