Value of some items

New to the forum but thought you guys could help me with some info on some items I have. I have 2 Rowland Research amps not sure the series or how to know, 4 amps with no name only a plate with the model WL-500 and a serial number, a Polk SRT 5 speaker system, and a Win Laborties pre amp and turntable. I haven't been able to find out much info on these things especially the turntable. I have pictures but don't see where to post them here. I would greatly appreciate any help in figuring out a little more detail about these pieces and what the value may be to try and sell them.
You can post the pictures as your "system" and then ask for comments and/or details...
Or you could check out the link below to photo of classic JRDG products

Try google