Option 1: $240 per tube with one year warranty If the amp was designed to have only one rectifier tube for both channels, then 5U4G is more suitable. Stereo 300B tube amplifier needs to have one 274B rectifier tube per channel, two 274B rectifier tubes for two channels. This Aqua 274B can directly replace 5U4G in most amplifiers with great sonic improvement.Īqua and WE 274B tubes would deliver 150ma-160ma of current at 430vDC per 274B tube. To overcome this limitation, Sophia Electric came out with a newly designed Aqua 274B rectifier tube to raise the limitation from 8uf to 47uf. But for a typical 300B single ended amplifier, it is usually larger than 8uf. The max value allowed for the Princess 274B mesh plate is 4uf, or 8uf for the Princess 274B rigid plate. However there is a catch - the first capacitor after the rectifier tube needs to be small. Sophia Electric Princess mesh plate 274B and rigid plate 274B tubes have been widely praised as the best sounding rectifier tubes ever made. "The Sophia Electric Aqua 274B rectifiers are just so good that my other rectifiers paled in comparison, with Aqua 274B's being transparent, nuanced, smooth, colorful, natural, and dynamic presentation, that makes the music sound live, beautiful, and emotionally involving-they're something special!" - Jeff Day "The Sophia Electric Aqua 274B rectifiers easily outperformed my British NOS Haltron 5U4G rectifiers and the also excellent NOS RCA 5U4GB rectifiers, making them sound lean, washed out tonally, bleached in tone color, and rather average, which they aren't!
Jeff Day's Positive Feedback Online Review: “The sonics with Sophia Electric Aqua 274B rectifiers were superb, with a huge sense of space, vividly present images, a wide and deep soundstage, lots of resolution of musically meaningful nuance, and superb dynamics. If you have an amplifier that will accept a 274B rectifier, I've found the Sophia Electric Aqua 274B rectifier an easy path to better performance." - Jeff Day "The Sophia Electric Aqua 274B rectifiers remain my all-time favorite rectifiers for that same combination of clarity, resolving power, and naturalness that they share with the Sophia Electric 45 mesh plates. Jeff Day's Positive Feedback Online Review: The Art of Vacuum Tubes: Sophia Electric 45 Mesh Plate Triodes and Aqua 274B Rectifier I should add that the Aqua 274B rectifiers from that 2017 review are still going strong four years later, and are still sounding as fantastic as they did when I first received them. Nothing has changed since then, and the Aqua 274B rectifiers are still my all-time favorite rectifiers for their superbly balanced combination of clarity, resolving power, and naturalness that they share with the Sophia Electric 45 mesh plates. Condition: NOS, TESTED IN GOOD CONDITION.2021 Positive Feedback Writers’ Choice Award : "I've already given a well-deserved Writers' Choice Award to Sophia Electric for their Aqua 274B rectifiers in 2017.
#Rectifier tube 274b 5r4gyb specs comparison free
If you have any question or need more information, please feel free to contact me! Thank you for watching. Won't ship to China, Sorry for any inconvenience. (5U4G is rated for 225mA, 5U4GB for 275mA.) Compared to a 5AR4, itll sag and soften attacks quite a bit. Payment : Paypal only, payment within 3 days after purchase Shipping : USD 40.00 for world-wide except China, the tube well be packed really well. Looks sexy, but its more of a 5U4 with a 200mA current rating. Test results: Tube 1 : 60 52Tube 2 : 56 53 TERMS OF SALE: Serious buyers only, please. Please look at picture carefully before purchase. Seller:chineng3696 (169) 100%, Location: Taipei, Ships to: Worldwide, Item: 123709846721 IT'S RARE TO FIND PAIR OF NOS ENGRAVED WESTERN ELECTRIC 274B Brand: Western Electric Model : 274B Made in USA Condition: NOS, tested in good condition (tube tester TV-7D/U), without original boxes.
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