USA Voltage Sophia Electric Signature 91-01 300B Single Ended Mono-Block Amplifiers
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Highlights of signature 91-01 300B mono-block amplifiers:
1. Upgraded to 91-03 driver circuit.
2. The new signature 91-01 output transformer is a significant upgrade over the standard 91-01 model. It incorporates the 2023’s 91-05 model winding method, delivering a spacious soundstage and featuring vintage WE iron core material to reproduce the classic WE sound.
3. The new aluminum chassis features 6.5mm (1/4 inch) thick aluminum plates and blocks, providing a robust and solid foundation for superior sound quality. Additionally, the refined internal layout structure enhances sonic performance, making it a significant upgrade.
4. The stock tubes include two Grade A Classic II 300Bs, two NOS Chinese 6SN7s, and two NOS 5Z3PAs
Why should you go for 300B single ended amplifier?
Within its 8-watt-per-channel power limit, the 300B single-ended amplifier offers the lowest intrinsic distortion of any solid-state or tube amplifier design. It is the dream amplifier for audiophiles and music lovers worldwide. If your speakers are compatible with 8 watts per channel, the 300B amplifier is the top choice for exceptional sound quality.
Sophia Electric’s Richard Wugang redesigned and modified the 91-03 stereo amplifier to create the 91-01 model in a steel chassis, catering to those seeking a mono-block design at a more affordable price point. The standard version quickly became a market favorite.
Read Jeff Day's review below for more details:
Positive Feedback Review: "The Sophia Electric Model 91-01 300B mono amps are audiophile dream amps, they have great sonics top to bottom, bass articulation that is the best I've heard, and the SE 91-01 nails all of the nerdy audiophile things like soundstaging, imaging, sense of space, and transparency in such a beguiling way that even music lovers that don't give a rat's ass about audiophile-type sonics will appreciate its prowess.
I recommend these amps heartily, and I'd give them my normal 'two thumbs up' endorsement, but that just wouldn't capture what these Sophia Electric Model 91-01 300B mono amps are capable of, so I've invented a new rating, the 'two hard nipples up' recommendation, which is the highest award I've given out to date." ––– Jeff Day
User Experience:
Hello Sue and Richard,
I want to take a moment and thank you for building wonderful sounding and beautifully built 300B mono amplifiers! We manufacture a high sensitivity line source loudspeaker system (Arion Audio Apollo System) and needed high quality mono amplifiers for our showroom. After doing our research we chose the Sophia Electric Signature 91-01 300B Single Ended mono amplifiers.
I purchased the pair of your Sophia Electric Signature 91-01 300B SE mono amplifiers about six month ago and couldn’t be happier with their performance. The sound and performance of the main system in our showroom which includes our new Arion Audio Apollo speaker system and the Sophia Electric 91-01 Signature 300B SE mono amplifiers have impressed everyone who has heard it. The system sounds powerful, yet detailed and delicate. The amplifiers have impressive high frequency extension but never sound harsh or piercing. The ever-so-important low midrange / upper bass is well articulated and musical. It’s easy to follow bass lines. We will enjoy our pair of Sophia Electric 91-01 Signature 300Bs for many years to come.
I must add that working with both Sue and Richard has been a great experience. Thanks!
Mike Kalellis
Arion Audio
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