... 8 gold-plated DIP sockets for OPAMPs and Buffers rolling- 2-Setting Gain Jumper for impedance matching - Powered by 12.6V ... hours play time with stock opamps (TLE2141 Class A*2, BUF634U*2, dummy adapter*2)- High output power, 600mW+600mW into 32Ω- High ... , and opamp rolling kit. (includes AD797*2, OPA604*2, TLE2141 Class A*2, BUF634P WB*2, BUF634U*2, Transistor BUF*2, Dummy adapter*4) iBasso P4 Warbler ...