You have acquired a GREAT receiver. I've owned mine since new in 1980. It's built like a tank. Back in the day, it survived 6,7, 8 hour parties with 3,4, pairs of speakers blasting. Sounds great, a ton of power, seems like much more than 60 wpc. It runs hot so don't be alarmed by that. Has been that way since new. I've always loved the design of this unit. When I saw it in a stereo store I knew I had to get this one! Got it for my birthday that year from my parents.
It's been in regular use since I got it. I now have it connected to my Mac Pro via DAC for streaming music. I'll never part with it. I'm currently running 3 pairs of KLH's and it sounds incredible!
I bought my daughter the R-S33 for Christmas last year and she loves it. JVC made some great equipment back then.
Cheers, Glenn