TWO Texas Instruments OPA1612 Dual Discrete DIP8 OpAmp……compatible with the VTV Amplifier Custom input buffers (tube or solid state), but may be used in other amplifiers as well.
This is the opamp chip used on the Purifi FE-02 and FE-03. This is a great reference opamp to aid in selecting discrete upgrades.
PAIR of amps for stereo amplifier….one for each channel.
Engineering datasheet here