Thanks for your kind reply. The problem is the source of the 2nd hand Amplifier. Most of them were not sold by the formal distributor, so it is impossible to get after service from the authorized technicians served in the distributor. Also, the old equip. might run out of parts either, that means you might unable to get is fixed. Even though some good old gear were using good quality parts, but after 20 years or more usage, there is higher possibility of repair requirement. You have no way but to find the service engineer around the corner.
Lots of knobs might cause more repair chance
Pre-amplifier like Accuphase, they have many functions and according to the opinion of my hi-fi friend, he said, the more knobs on the equip. , there will be more chance of repair.......... Is it true? I am thinking about purchase of Accuphase C-290 which is around 22 years old from it's launched date, do you think it is still a good gear for using such kind of old hi-fi?