Help ! Advice needed . I have been searching for my first hi-fi system . And I have a soft spot for vintage Pioneer . Came across a SA-9800 for sale , but the seller is taking bids for the highest offer he gets . What would be the local value of this amp ? He also has a SG-9800 EQ ....taking bids . The amp is missing 2 knobs , and the EQ is missing 4 slide 'buttons' . Should I buy these , would replacements be easy to source ? Help please . Still a fresh newbie .