The pace with which Mr. Syomin's Sound Laboratory launches new devices is amazing. And these devices are not at all humble ones e.g. single-enders on a roll-formed chassis. The S.A.Lab's production plant in Podolsk is equipped with modern machinery and measuring equipment. Equally important is the fact that the company itself designed the proprietary technology of transformer winding. And this transformer can be rightly called the heart of a tube amplifier. By the way, the winding unit design is closer to art due to multitude of conflicting factors whish can't be calculated exactly and one has to exclusively rely upon experience and intuition. It's no accident that transformers from Tango, Tamura, Partridge, UTC etc. hand-wound in the 20th century cost a lot nowadays. The transformers recently manufactured under famous brands aren't highly ranked by the connoisseurs of tube sound for old masters' secrets are believed to be lost and the materials aren't what they used to be.
«The output stage of every mono block utilizes six 6П36С beam tetrodes (thoroughly matched and manufactures in the USSR in 1970s — three tubes in each pole) working in push-pull ultralinear mode».
Samson MkII mono blocks' output transformers are the same Hercules has: they are hand-wound on a core made of the best Russian electric grade sheet and have size-to-power ratio of 1200 VА. The archtecture, which ensures wide frequency range and low losses, Alexey is going to patent.
The output stage of every mono block utilizes six 6П36С beam tetrodes (thoroughly matched and manufactures in the USSR in 1970s — three tubes in each pole) working in push-pull ultralinear mode. Such mode being something of an intermediary between working as pentode and as tetrode enables, among other things, to lower the dependency of THD on the load impedance. Besides, there's no need to sacrifice a significant amount of output power. In our case six tetrodes provide 200W at any load impedance — thanks to the separate lines for connecting 8Ω or 4Ω speakers. The voltage amplifier utilizes 6072 tube (a double triode); driver is based on 12 W 6V6 pentodes (the substitute for the Russian 6П6С tube) working as triodes.
Power supply is not as substantial as Hercules's but it also utilizes low slump Schottky diodes, chokes and substantial smoothing capacitors.