2A3 circuit tube amplifier. Pl note that this is not Sun Audio but it has the same circuit n design as Sun Audio. Replaced with audiophile quality component by a local shop in Bencoolen St. Best match for vintage speakers Like Jbl or lowther, Altec, Goodman, etc. 2A3 are built to match the need for vintage speaker that required low power pure triode tube to sing best without Harmonic distortion. Output transformer and power transformer n choke and audiophile grade component are added to sound good. Quality Tubes are new. I give a week warranty to buyers. Condition 9/10.