780s
I got a real soft spot for 780s. I have owned about 100 of them and only one dead one and that was a tuner never had a amplifier problem. Heard about some that did but I never did.
Is yours made in Japan or Korea? As hard as I could look I couldnt tell the difference, however I have seen 3 different 780s at least as far as the type of lights it uses. Some screw in, some pull out and some have to be soldered in. . .