wellness , fitness , well being , quality of life , mu , 42 , Tendon of Sound , whatever :buehehe:don't make that mistake again , and read seriously what I wrote :sarcastic_hand:you remember how's measured AC gain (of Aleph CCS) in Aleph output stage ?pretty much the same - feed it with 400Hz sinethen measure AC voltage across lower SS source resistor ( R37 // R31 ), then measure across upper SS source resistor (R22 // R29)compareI didn't ......