Up for sale here is this complete rebuild kit for the Kenwood KA-3500.  This includes all the parts you need to rebuild all the boards in the Kenwood KA-3500.  It has replacements for all electrolytic capacitors, as well as replacements for some of the small signal transistors.

This kit includes:

Power Amp:
19 capacitors (Nichicon PW, Nichicon VR, Wima film))
4 transistors (HFE-matched pairs)

Small Preamp Board:
7 capacitors (Nichicon PW, Wima film)
2 transistors

Large Preamp Board:
10 capacitors (Nichicon PW, Nichicon KL, Wima film)
4 transistors

Control Board:
18 capacitors
8 transistors

These are all high-quality brand new genuine parts, the same ones I use when I rebuild vintage gear.  The capacitors are 105° Panasonic FC, Nichicon PW, Nichicon KL, Wima film, and Nichicon VR (for the main caps) at the correct uf and the same or improved voltage ratings, and the transistors are OnSemi.

I will include surprisingly well-written instructions, but this is a fairly complicated rebuild, and you should know what you're doing and have a decent soldering iron and a dim-bulb tester with a 40W, 60W, 100W incandescent bulb.  Please see my pictures for details.

US shipping and handling is $5, and international is $18.  If you have any questions, please ask.