Ps53os0 ?

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I have a pair of boards fully populated with 16 .47ohm/3w resistors and 16 IRFP240's with the title "PS53OS0" on the upper right hand corner of the board. These came from a pair of heatsinks that Nelson gifted to me at BA 07. Does anyone know what they are?

I can post pics later if no one knows. I used the search function before posting.

Best,

Chris
 
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