Hello Raoultrifan I thought if you ever had time to insert OPA 2604 back in I/V and make sure balanced out is connected, and then check for oscillation. As I said when running in balanced out the 2604 run cool. However when you run RCA out the opamps heat up in pairs 1 and 3 the 2 and 4. Years...

QUOTE FROM RAOULTRIFAN I really liked it, but OPA2604 were very hot to touch and when I measured E1's power consumption I realized that each OPAMP is getting an additional power of almost 1W/each (over 15W with OPA2604 vs. almost 12W with NE5532)! Scope did proved that OPA2604 is oscillating in...