Marantz 2325 power amp, H704 & H705 ?

[x-rayrad]

During the rebuild of the amp board (P700) noticed H704 & H705 are 2SA722 & 2SC1845, schematic calls out 2SA720 & 2SC1318. Both channels are the same. Any one know which is correct?

 

[Jailtime]

Probably just a mid production change, and Marantz didn't bother to update the schematic or service data. KSA992 and KSC1845 are modern subs if you're looking to replace them.

 

[quaddriver]

720/1318 is a not-uncommon marantz pairing and they handle more (milli)watts than the 992/1845 pairing. On a machine I am doing I went a bit larger since they are drivers on a small 10w machine...YMMV - what are they in the circuit, given no SCM in front of me...

 

[x-rayrad]

They follow the differential amp, just a stage before the pre-drivers.