Sophia Electric S.E.T. 845 SET amplifier uses litz wire for the output transformer (the world’s first commercially viable) with super high-grade iron material. Point to point Silver wiring.

This amp is unconventionally built for the best possible sound in mind. The design has the shortest signal path with all resistor and capacitor leads cut to less than ¼ inch long. So the conventional approach does not apply to this amp. There is little that conventional Tweaks can add to the performance of this amp (plus the 1000V inside the chassis argues against tweaking). Of note: the size of the amp is very small (about the dimension of a laptop computer, 15 x 9.5 x 2 inches). Each mono-block weighs 40 pounds. Must be seen to believe. It was first designed for the Japanese market where real estate is more expensive than gold.

Input tube is a direct heating type, mounted on a three-point suspension (much like a high end turntable design). Sophia Electric is also the first one to use this new old stock JAN tube in high-end audio application. This tube has super sonic performance and was made in 1950-60’s by GE, RCA, and Raytheon for the US military applications, so reliability and quality is second to none.

There are 3 transformers and two chokes per channel. The power transformers provide 350 watts of power, yet in super small size. The secret is using very expensive Japanese iron material, so there is no hum, no vibration, and it generates much less heat for a powerful 845 Single ended amp. How is the sound? The amp has great dynamics, extension at both ends, and transparency. Most importantly: it is extremely musical with a rich tonality that nevertheless remains accurate. It makes other amps sound dead.

25 watts output from a single 845 tube per channel. Super linear, distortion-free sound, just like live-performance. When you listen, you believe.

1. 6SN7 drive 845 single ended, 22 watts per channel.

2. A different model using 205D drive 845 single ended with all direct heating tubes in the signal path. 205D was the grandfather of 2A3 and 300B. It is the best sounding direct heating tube, however, the used 205D made by WE before new production of Sophia Electric 205D becomes available. This amp can use rigid 205D and a new tube, which has 3X of the 205D mesh plate. (Note: the 205d tube can be prone to hum, unless manufactured under strict quality control. Ours offer assured durability and trouble-free operation.)

Why use the 205D as a driver? The Sonic Purity is unmatched by any other tubes including 300B or 2A3 as driver tube. You can listen all day long with this baby.

Note: In the photo, the blue light tube is 866-rectifier tube made during WWII. The version using this 866 tube is not available at this time. 5Z3/274B is being used as rectifier tube for the 845 model using 205D drive 845 as an alternative to 866.