Sophia Electric KT88-ST Tube, the best KT88 ever made for Western Amplifier, GEC

The Sophia Electric Blue Glass KT88-ST is the best KT88 tube ever made, surpassing both current and vintage production in terms of sonic performance and reliability. All tubes are brand new, come with a warranty, and are reasonably priced given their exceptional quality. If you buy two, you will receive one matched pair. If you buy four, a matched quad (4x) will be sent. All tubes are tested and matched by Sophia Electric, with a 30-day warranty. For more information, please refer to Jeff Day’s review in Positive Feedback Magazine and buyer feedback. Please note: No returns due to the fragile nature of glassware. 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, voluminous presentation of audio from music and film sources, and they are at a level above any EL34 vacuum tubes I have heard with respect to overall musicality and visuospatial performance. The Sophia Electric KT88-ST does remind me of the voicing of a classic 300B vacuum tube, with a smooth, rich, nuanced, and voluminous presentation of music and film. The KT88-ST is darker overall than the EL34-ST, and at the same time more vivid in imaging terms. Both the Sophia Electric KT88-ST and EL34-ST vacuum tubes shared a common trait in my audio-visual system, which is that they both produced a “bubble of acoustic immersion” that placed me into movies in a way that I felt like I was participating in the unfolding events, rather than just merely watching them, as with typical KT88 or EL34 vacuum tubes. Regarding amplifiers, if you are the owner of an original Leben CS-600, I think the Sophia Electric EL34-ST was the best match for the CS-600’s voicing. The new Leben CS-600X is considerably different in its voicing, and I found the Sophia Electric KT88-ST to be the best match for the CS-600X. In both cases, the Sophia Electric vacuum tubes elevated the performance of the Leben integrated amplifiers beyond anything I have ever experienced from them with more typical EL34 and KT88 vacuum tubes, both in terms of musicality and visuospatial performance, and it is safe to say that the performance of these two integrated amplifiers was much higher than I thought possible when the Sophia Electric vacuum tubes were installed into their circuits. To broaden the scope a bit to other amplifiers that don’t allow for multiple choices of output tubes in their circuits like the Leben amps do, I suspect that if you have a dedicated EL34 or KT88 based amplifiers, that you will realize similar performance gains with the Sophia Electric KT88-ST and EL34-ST vacuum tubes in their circuits. Both the Sophia Electric KT88-ST and EL34-ST vacuum tubes are easy recommendations for their stellar performance in terms of musicality, as well as their impressive visuospatial performance. The Sophia Electric KT88-ST and EL34-ST vacuum tubes are quite a bit more expensive than more generic KT88 and EL34 vacuum tubes, but they are a classic case of you get what you pay for, in terms of musicality and visuospatial performance. With the long operational life of the Sophia Electric KT88-ST and EL34-ST vacuum tubes in comparison to more generic vacuum tubes, the higher cost of the initial purchase will be offset somewhat over time, as more generic tubes will likely need replacing several times during that same amount of time, making the more expensive initial costs of the Sophia Electric vacuum tubes cost effective over the long term. “