Other Parts Discussed in Thread: NE5532,
I am using 2 OPA 1622 op amps in a DIP 8 configuration as replacement to the 2 x NE5532 that came with my Douk Audio B4-X hybrid headphone tube amplifier. Lately a sizzling sound is coming out of the headphones. When the volume pot on the amplifier is turned all the way to the maximum this sound tends to gradually diminish. However at listening volumes this Sizzling sound drowns out anything coming out of the headphones.