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FEEDBACK FEEDBACK FROM WHEN Excellent Transaction!!! Fast Shipping. A++++++ Seller!! Last Sophia Electric mesh plate 274B in Western WE-specs for tube amplifier 300B (# 275485438699 ) Buyer: dcote767 ( 779 ) US $349.99 Verified purchase Past month The price is for one tube , brand new in box, with a 30-day warranty. This is the last Princess Mesh Plate 274B by Sophia Electric. The Sophia Electric Princess Mesh Plate 274B tube has been incredibly hard to find since early 2020, and it quickly sold out worldwide. If you're interested, act fast—these could be gone for good. I only have a few left in stock. The Sophia Electric Princess Mesh Plate 274B tube is a premium rectifier, designed as a direct replacement for 5U4, 5R4, and 5AR4* tubes. Its plate structure is three times longer, resulting in a deeper and wider soundstage, as well as a smoother sound compared to the Mullard 5AR4. Historically, the WE 274B was designed for the WE 300B amplifier. Today, a used WE 274B can range from $2,000 to $4,000 per tube, often with no warranty. According to end-user reports, the Sophia Electric Princess Mesh Plate 274B significantly outperforms NOS WE 274B, delivering superior bass, better dynamics, and a deeper soundstage in the right application. The sonic difference compared to more common 5U4, 5AR4*, 5R4 is far bigger than any cable upgrades combined in a high-end system. Sophia Electric 274B is an 8-pin octal-based tube and Sophia Electric 274A is a 4-pin based tube. Our friend Art Audio is using Sophia Electric™ 274B in the Art Audio PX-25 amplifier and several pre-amp makers are using this tube for the high end tube pre amp. Increasingly, there are more users used this tube in the headphone amps with great feedbacks. Note(*): 274B is a direct heating tube. The indirect heating 5AR4 may turn on slower; however, people who buy 274B are for its much superior sonic performance. To fully utilize its benefits, it may require the first stage capacitor (capacitor input) to be less than 10MFD; otherwise, it would shorten the 274B life span (very much like smoking is bad for your health). It would not be a problem with common choke input. Please consult your amplifier maker or refer to a tube manual. This 274B is an update of the NOS WE 274B, so both share the same characteristics. The maximum current capability for Sophia Electric 274B mesh plate tube is 90ma, suitable for tube pre-amp and mono-block 45 single ended and 2A3 mono-block single ended amps and headphone amps. I would recommend Sophia Electric blue glass Aqua 274B tube for 300B amplifiers. The maximum current capability for the original Aqua 274B tube is 160ma and Aqua II 274B would have above 200ma current capability.