Studio Reference Amplifier

Hello
Can anyone tell me what is reason for burning R26 in sr100 and what is the right value for R30 its 220e or 1k
 

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    APEX SR100 Sch.jpg
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Hello my dear forum friends, how are you?
I assembled the SR100 amplifier and am using it on a -30/0/+30vdc source, I would like to know if it is safe to use the SR100 with a -45/0/+45vdc source at 4ohms, and if there is a need to add 4 resistors 2k2/2w instead of 1K/2w? as there are layouts with these two resistor values on the boards.