This mod is based on Rob Robinette's 3 way negative feedback switch found here:
https://robrobinette.com/5e3_Modifications.htm#Switched_Negative_Feedback
Up position - 'Stock' with no NFB and bypass cap on
Middle position - Bypass cap out, no NFB
Down position - Bypass cap out, 51k NFB added
SPDT on-off-on switch used.
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