PEAVEY TB Raxx Bass Pre-amp
Something of a classic, and one that I'm very pleased to own. Obtained as as swap from a fellow bassist: I wanted his TB Raxx, he wanted my Ashdown compressor and £20 ...deal!
This is a true all-valve pre-amp, and sounds like it. The only silicon devices in it are the power supply rectifiers! There are two ECC83 gain stages, each with its own EQ. Stage 1 has a passive Fender Bassman-type tone stack, while stage 2 uses a 3-band active setup. Apart from a few boost switches, that's it. Like most Peavey gear, it's built like a tank and never breaks down. I love it.
To find out more, download the user manual:
PC/Win: Right-Click the picture and choose "Save target as..."
Mac OSX: Ctrl-click and choose "Download linked file"