Ah, a 1020. I actually had one in the 80's, driving a Dynaco ST70. For the shelf, you could get a piece of maple cut the same length and depth as the current one, but 3/4" thick. Get it at a real lumber yard though, not Home Depot. I just had some Alder cut at HD for a small project, and the cuts were pathetic. Don't those guys take any pride in their work?!