My second built is a 500 series microphone pre-amplifier. This is pre-amplifier use WIMA capacitors and THAT Corp. ICs.
There is a second part of an optional pre-amplifier 'color' circuitry that can be added. I have the 15ips tape emulation circuitry which will be my next project. I will add some recording samples when I have the chance to do so.
Here are some picture: