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1968 Gibson Super Medalist all tube amp


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I got this amp recently and it looks great, amazing cosmetic condition and all electronics look good inside. Everything original , including the tubes , but the two 7591 power tubes are shorted, so I ordered a new matched pair. 
my task now, is to find information about the bias setting for it. 
this, and any other information about the amp , would be great, even if it’s not technical. 
thanks, best regards. 


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I don't know much about them.  I just looked at the schematic.  here -     https://schematicheaven.net/gibsonamps/super20_medalist.pdf

It looks like the bias is not adjustable.  Just install new tubes and go.  You should be measuring about -8.7 volts at pin 6 of the new power tubes.  The schematic says +8.7v, but it should be -8.7v.  

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