The regulator failure was due to not completing the whole repair the last
couple of times. Capacitor problems are the cause of the regulator
failure. Do not forget to double check the regulator bypass resistor to
see if it has increased in value or opened up.

Welcome to the world of just about every Mitz set from that era, mass
capacitor replacement is required for a proper long term repair. Most
people are not willing to put the kind of money into the set for a good
repair after 7 or so years.

David