rubicon 2500 problem any one can help?

[hadidin]

hi i have problem with that amp every thing looks ok but i dont have clear voice on output terminal something like windy noise i detect some heating on driver borad i changes all driver transistors with 2sd667 and 2sb647 and i lost output at all,
anybody can help me please???
thanks

 

[Perry Babin]

Which 'driver' transistors did you replace on the driver board?

 

[hadidin]

a1275 and c2388 i think small pack transistors i measure voltage on c/e about 75 volt and i replace with this transistors
but i tested after removing and transistors are ok

 

[hadidin]

i forget something i inject signal from my function generator to amp and i test signal on "IN" pin of driver board with oscilloscope and looks good just have some amplify on signal no distortion
signal: 0.5vpp 38hz

 

[Perry Babin]

Did you twist the legs around so that they matched the original transistors (which have a different pin configuration)?

 

[hadidin]

no have same pin configuration

 

[hadidin]

have this amp service manual or any schematic....
at least driver board???
thanks for reply

 

[hadidin]

nobody can help me?