Hm, those transistors are way obsolete and hard to find their datasheet. I think they are 120-150V, 8A, 50W transistors but I'm not sure. Try to replace them with MJE15030/ MJE15031.
http://www.onsemi.com/pub_link/Collateral/MJE15028-D.PDF
Edit: are you sure you read it right? Maybe it's MJ15003? Dunno.
http://www.onsemi.com/pub_link/Collateral/MJE15028-D.PDF
Edit: are you sure you read it right? Maybe it's MJ15003? Dunno.
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