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Old 30th September 2010
  #12
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SPX90 Service Manual

Oh right, the cap values!

C21 = 470mfd/25v

C23 = 1000mfd/10v

It would not be bad idea to replace all the electrolytic caps.

You can download the entire service manual by following the info on this page: SPX90 Schematic It does not have a lot of PSU info, but it does have schematics.