The G series receivers do not have the Dolby board problems of the 8080DB/9090DB receivers. The 8080DB/9090DB receivers are superior to the earlier 8080/9090 receivers in that they have a fully complimentary amplifier, and some other refinements such as the tuner power supply. Fixing the Dolby board is a PITA and fairly time consuming, but once that, and eliminating the fusible resistors, is done, they are very nice sounding, excellent reliable units.@Bright_Star, I'd have to look at the G-9000DB service data, it may be it didn't have a double sided board to be an issue to begin with. I only have a G-9000, not A DB, so can't check the unit itself to see.
Another difference between the 8080/9090 and their respective DB variants, is that the former have quasi-complementary output stages, the latter are fully complementary. The change to fully complementary also yielded a modest power increase, 110WPC to 125WPC on the 9090DB