Looking for info and opinions on electronic industries dual 100a

I have a two chassis electronic industries dual 100a I got from a family member.  I had it gone through by a tech since it had been sitting for a while and he replaced a couple caps..fired it up and it sounded pretty good through some less than stellar speakers.  I know it’s a very early Bill Johnson (arc) amp but don’t know much else about it.  Are they well regarded?  Any idea what it would be worth?  Thanks for any info