Thank's Jhonatan75 for your courtesy, but I have a lot of technical information to interchange with you and the other members. I introduce myself: my mame is Vittorio Caselli and I am from Chile, old man (60), sorry for my english.... I love Sansui of the seventies. My first was a AU-222, today alive, others: AU-555A and AU-D11. Also I restore Antique Radios and tube amplifiers. My best Regards.