I have an early 80's "Son of Ampzilla" model 401 made by the Great American Sound Company. It's been in my closet for about 20 years unused. Called the company and they told me it probably needed to be refurbed and would charge me about $450. Is this worth it? Should I just plug it in and see what happens? I need some advice as I need a power amp to pair with my Demeter HBP-1 and 2x10 ported Ampeg cabinet. Just wondering if this is worth it or should I just buy a more recent Crown (or similar)? Thanks.