Sophia Electric Premium 6SL7 Options:Grade B (Top 25%) with one year warranty closed-back Transducer type Dynamic Frequency

closed-back Transducer type Dynamic Frequency response 5 Hz-45 kHz THD <0

six neutral cotton damping cores

"The Sophia Electric KT88-ST does remind me of the voicing of a classic 300B vacuum tube

and a toroidal ground-filter geometry that extends the path to ground to three times the cable length

Sophia Electric Premium 6SL7 Options:Grade B (Top 25%) with one year warranty closed-back Transducer type Dynamic FrequencySophia Electric Premium 6SL7 Sophia Electric 6SL7 tube does not look like a typical 6SL7. By looking at the internal plate structure, it is more of a European tube structure rather than North American 6SL7. However the vintage European ECC32 33, CV181 CV1988 family of tubes are not real 6SL7 tubes. What is the story? Sophia Electric designers were smart enough to take European virtue combined with North American 6SL7 electrical tube characters,