This morning, I've been listening to my set of Wong Kuan Wae modified Vido, connected to the iBasso PB2 (w/Sparkos SS3602 op-amps). EDIT: In the PB2, there are 4x 0-Ohm Adapters installed, rather than Buffers - between the Volume Control and the SS3602 op-amps. . Left Case - came with PB2 (from the Left) - Column 1 = 4x LME49710NA (1-Channel Op-Amp) Column 2 = 4x OPA604AP (1-Channel Op-Amp) Column 3 = 4x AD797AR (1-Channel Op-Amp / Buffer) Column 4 = 4x BUF634P (1-Channel Buffer, Class A Bias) Column 5 = 4x BUF634U (1-Channel Buffer) . Right Case - some of my Op-Amps (from the Left) - 1x Sparkos SS3602 (2-Channel Discrete Op-Amp) 2x MUSES02 (2-Channel Op-Amp) 2x OPA627AU (Dual 1-Channel Op-Amps) 2x Burson V5i-D (2-Channel Op-Amp) 2x OPA1622 (2-Channel Op-Amp) 2x LME49720HA (2-Channel Op-Amp) 3x Burson V6 Classic (2-Channel Discrete Op-Amp) . EDIT: Fixed typo on the OPA604 line.