Audio Experience YSA200S Mono Block Power Amplifier is a True Full balanced design power amplifier. It provides sound deep and wide stage, accompanies with reality sound image and a emotions sound presentation.

 

Features

　

They have two power amplifier unit for positive pole and negative pole at each block. Two block total four power amplifier unit. 

The structure of each power amplifier unit:
The input stage is 12AT7 SRPP direct coupling to 12AU7 driver stage , The driver stage use high quality capacitors to EL34 power tube , The EL45 work at P-P UL mode to driver TANGO FE-50-5 high quality output transformer , The FE-50-5 output transformer has very low Insertion Loss 0.31dB only. ( Many tube power amplifier in Hi-End audio market , Their have the output transformers is over 1dB Insertion Loss . only about 10% very high price tube amplifier use under 1dB Insertion Loss of output transformer ) . The output transformer has low insertion loss is very important , the best of the best is 0 dB Insertion Loss , The output transformers for High End tube amplifier need under 1dB  Insertion Loss . The Insertion Loss over 1.5dB output transformer will lost many low level music.

The bias adjust of power tube is very easy , all bias test point and bias adjust at top of amplifier.

 The components ,  NFB value , tube type , circuit all select by listen test.