Inherited system

Audiogon offers "bluebook" services to help you establish basic equipment values. Not sure of the cost & as mentioned above, I would contact the more reputable sued dealers & talk w/ them. Good Luck. 

I heartily endorse @sbank’s recommendation to contact The Music Room. For your intended purpose, I believe they will offer you the most hassle-free transaction.

Well that escalated quickly.......

I'd say that he asked for it.

@westenotto hifishark.com to figure out relative values of components; country specific also.

I see @sbank  also referenced this. +1 to his full post.