The 9407k preamp is a combination of tube and solid-state circuitry.  A NE5532 opamp drives two 12AX7 gain stages, which are fed low plate voltages (“starved plate”) to exaggerate their inherent non-linearity.  The amount of tube saturation may be adjusted by a “blend” knob which blends between the pre- and post-tube stage signal.

Notable Features:

• “Starved plate” circuitry
• Uses two Sovtek 12AX7 tubes
• Adjustable “Tube Drive”
• Includes wall-mount power supply
• Designed for PAiA’s 9407C case

Price: $82.31

Adjusted Cost: $96.54/channel (two channels)

PAiA gives a $12 discount for two kits, making the price $152.62.  Adding the 9407C rack case at $40.46 makes the total $193.08, or $96.54/channel.

More information at www.paia.com.