Help me pls with B&K st-140

[tony Ma]

Hi there I need helps on my old B&K ST-140
Suddenly my power amp went dead and these are what I did already

• Replacing each side with new 2sk135 and 2sj50
• Replacing each side with new 2N3440 and 2N5416
• Replacing each side with new 100uF/100V and 47uF power supply electrolytics (silmic elna)

but still the there is sound coming out. I did check the BIG capacitor and there is a current over there. After I plug in, there is about 63 V still store in cap.

Any one can help me? Any idea why this amp still dead?
I am suspecting my rectifier might have a problem.
I could not find any replacement yet for this one (FPI4020W)
FPI4020W pdf, FPI4020W description, FPI4020W datasheets, FPI4020W view ::: ALLDATASHEET :::

 

[tony Ma]

Any one can suggest me with PS replacement? I think I found the schematic
http://4.bp.blogspot.com/_WeC7--3HfTI/TIeq2tycYqI/AAAAAAAAAO4/tFsjWiXJ8tc/s1600/st140.jpg
Any one can help me with PS design using the tyrodial from this B&K? tks so much

 

[tony Ma]

any one can recommends repair in OC or LA area?

 

[claudeb960]

I recently replaced a bridge rectifier in my B&K ST-140 - big improvement. Purchased from Parts Connexion:


Item Number: SEMI-68495
Description: 27A 600V IXYS FRED BRIDGE RECTIFIER VBE17-06NO7

This definitely works and is much faster than the stock rectifier.

Cheers.