Sophia Electric Coke-bottle KT88-ST Tubes (long life version) Options:Grade A (Top 10%) One tube with one year warranty the Blue transforms one of

the Blue transforms one of the most modifiable planar magnetic headphones ever made into a refined

Jeff Day's Positive Feedback Online Review: "The Sophia Electric EL34-ST vacuum tubes remind me of a cross between 45 and 2A3 triodes in terms of voicing

Fostex's proprietary bio-cellulose compound material that delivers rich low frequencies

selectable NOS and OS modes

35mm single-ended Line outputs Balanced XLR

Sophia Electric Coke-bottle KT88-ST Tubes (long life version) Options:Grade A (Top 10%) One tube with one year warranty the Blue transforms one ofSophia Electric Coke bottle KT88 ST Tubes (long life version) This patented Sophia Electric coke bottle KT88 ST (long life version) tube has the most refined sounding with best high frequency extension, a cure for the dark sounding KT88 amplifiers. Jeff Day's Positive Feedback Online Review: "The Sophia Electric EL34 ST vacuum tubes remind me of a cross between 45 and 2A3 triodes in terms of voicing, with a smooth, more brightly lit, nuanced,