The Sophia Electric Signature 91‑01 300B is a refined „Signature” version of the acclaimed 91‑01 monoblocks — in a pure single-ended configuration on the 300B triode, with no global negative feedback. It retains 9 W per channel and the characteristic, tangible 300B sound, but with upgraded, superior components for even higher resolution and musicality.
Each monoblock is based on a simple, audiophile circuit with a 6SN7 input valve, a 300B output valve and a valve rectifier, together with Sophia Electric’s proprietary transformers. A high input impedance and 4 and 8 Ω taps make it easy to match with efficient loudspeakers.
It is the choice for the audiophile who wants classic 300B in the best possible execution — uncompromising, with attention to every detail of the signal path.
| Output power | 9 W per channel (300B, single-ended) |
| Valves | 300B (output), 6SN7 (input), valve rectifier |
| Configuration | single-ended, no negative feedback |
| Version | Signature (upgraded components and transformers) |
| Speaker taps | 4 and 8 Ω |
Full technical specifications available on request.
The Signature version of the 91‑01 300B monoblocks — single-ended 9 W, no negative feedback, upgraded components. Classic 300B in Sophia Electric's finest execution.
