Here, you have a chance to buy used, but in very good condition driver board F-2624 for Sansui receiver model 9090DB.
I tested the next electronic parts; all driver transistors, all predriver transistors, the both STV4 bias diodes and all fusible resistors, so I can confirm that all driver and predriver transistors are good, as the both STV4 bias diodes (BTW very hard to find today!)... but I have found some fusible resistors were out of specifications, so I changed them by metal film resistors (pink dot on the picture).
As you can see, I have changed thermal grease on driver transistors too, because the old thermal grease was in very bad condition.
But because I can't do a complete test of this board, I am selling it as UNTESTED.
Please "click" on the picture to get bigger picture in higher resolution.