I have a Carvin RSP preamp, with a 12AX7 in the gain stage. This preamp sounds excellent. It doesn't sound anything like the new models with the "tube emulation" circuit. Active and passive inputs Adjustable input gain LED clip indicator Three pre-shape filters Bass and treble shelving controls Semi-parametric midrange controls Compressor Noise gate Variable crossover Nine band footswitchable graphic equalizer Footswitchable effects loop Balanced XLR out Two rack spaces I am downsizing, so it has to go. $200 shipped to the lower 48, or I'll trade for a digital recorder or ?