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274b's

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I have been using the Sophia 274b non-mesh in mine for over 8 months with no mods and no problems, they replaced mullard gz-37's, 5ar4's, 5u4g's and just about every other type of rectifier I could try. You will not believe the difference. More open, better extension top and bottom with better bass control and tonality. I believe the mesh 274b's run at a different operating point???? if you end up trying them let me know how they work out. good luck


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