You think?

Usually, after the vibrator is just a plain transformer and after that, a rectifying and filtering circuit. There's not much goes wrong there other than plain aging of components...

I played with vibrators when I had a GE Progress Line transmitters configured for mobile use. As OP and myself obtained these devices well used and with unknown history, reliability is pretty much in doubt. It'll be fun to restore it and I'd do it. (in fact I did) Would it be reliable enough for me to trust it? no....

Can you still get solid state replacements?? I know they existed for a while when these devices were actively used after their manufacturers declared EOL. I'm curious now...