I too have a CNP192, given to me in 1986. It saw a fair bit of use until the early 90's then just kept as a backup set.
It fired up fine the last time I tried it, even after 8 years in the garage!
Japanese sets of this era were extremely reliable and well made, I have a 13" Sony, never had it's back off since it left the factory nearly 50 years ago.
Mark