Been some time since I posted a project and this one is a good one to show off. I received this Marantz 3200 preamp for some restoration work and really like the compact design and layout of the unit. When top and bottom cover are removed the power supply, protection, and phono preamp are easily visable next to each other. The Preamp or tone board as Marantz likes to call them is foil side up under a black cover towards the front of the unit. For simplicity I removed the faceplate and unscrewed the tone slides to access the board. A combo of Nichicon high temp PW, Panasonic FC, and Panasonic stack film were used throughout. In the preamp section two bipolar elec caps were replaced with Nichicon ES BP caps, notice the bright green. Also, on the preamp a few tantulums were replaced with Nichicon low noise KL.
Transistors in the preamp and phono sections were replaced with Fairchild semiconductors which were matched well. The only adjustment to be made is checking supply voltage of 75vDC at pin J806 of the power supply and adjust with the trimmer as needed.
All cleaned up