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RE:Please verify that both OPTs have the same model number.

Posted by Eli Duttman on April 29, 2016 at 20:08:54:
Yes, the S5000-II used 7868s, which are electrically equivalent to 7591s.

Fisher, Scott, Sherwood, and (perhaps) other manufacturers took full advantage of the fact that small signal circuitry that successfully drives "12" W. power tubes also successfully drives the 7591 family. I'm on record suggesting "monkey see, monkey do". ;>)