Sophia Electric™ 274B/274A Rigid & Mesh Plate ValvesSophia Electric™ 274B valve is a premium rectifier valve for a 5U4/5R4/5AR4* direct replacement with 3X longer plate structure, thus it has a deeper, wider sound stage and even smoothier sound than Mullard 5AR4.
Historically, WE 274B was designed for the WE300B amp, the current NOS WE 274B is $1000 each unit (see Vacuum Tube Valley magazine), the used one can be as high as $500 on Ebay. According to a recent test, this Sophia Electric™ 274B valve outperform the NOS WE 274B by higher current capability, which translate into better bass, dynamics, and deeper sound stage.
The sonic difference comparing to conventional 5U4, 5AR4*, 5R4 is far bigger than any cable upgrades combined in a high end system.
Sophia Electric™ 274B is 8-pin octal-based valve and Sophia Electric™ 274A is 4-pin based valve. Our friend Art Audio is using Sophia Electric™ 274B in the Art Audio PX-25 amplifier.
Note(*): 274B is direct heating valve. The indirecting 5AR4 may turn on slower, however, people who buy 274B is for its superior sonic performance. To fully utilize its benefits, it may requires first stage capacitor (capacitor input) to be less than 10MFD, or 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 to your amplifier maker or refer to a manual. This 274B is an update of the NOS WE 274B, so both share with same characters. In 1930s, WE 274B was the rectifier choice for 300B single ended theater amplifier in the US.
The maximum current capability for Sophia Electric 274B mesh plate valve is 90ma, suitable for valve pre-amp and mono-block 45 single ended and 2A3 mono-block single ended.
We would recommend Sophia Electric 274B rigid plate valve for 300B amplifiers. The maximum current capability for this 274B rigid plate valve is 160ma.See reviews & opinions
Sophia Electric Princess™ 274B Pricing:
|Option 1: Mesh Plate Per Unit with one year warranty.||€255|
|Option 2: Mesh Plate Per Unit with 30 days warranty.||€195|
|Option 3: Rigid Plate Per Unit with one year warranty.||€215|
|Option 4: Rigid Plate Per Unit with 30 days warranty.||€160|
Sophia Electric 274B globe Pricing:
|Option 1: Mesh Plate Per Unit with one year warranty.|
|Option 2: Mesh Plate Per Unit with 30 days warranty.|
|Option 3: Rigid Plate Per Unit with one year warranty.|
|Option 4: Rigid Plate Per Unit with 30 days warranty.|
Orders and warranty