The 23.5 is an excellent amplifier, but it is not easy to service. The technician who services my equipment already repaired several and once told me that it is a lot of work as the amplifier is very compact and accessibility is not great.
If they were not yet replaced consider having all the electrolytic capacitors exchanged - the amplifier could get quite warm and they can be approaching end of life now.
Although you can find equivalent drivers and output transistors, when you replace one of them with equivalents you should replace all of them with matched sets.
If they were not yet replaced consider having all the electrolytic capacitors exchanged - the amplifier could get quite warm and they can be approaching end of life now.
Although you can find equivalent drivers and output transistors, when you replace one of them with equivalents you should replace all of them with matched sets.