K, so, then 68R belongs there as insurance against oscillations ?
pretty much so ....... though, can't be sure 100% without proper simulation (big amount of time) or - simpler but hardly achievable - without Papa's brain ......
😉
I'm not at all trying to question or challenge the 'why' of the original design. Just trying to find what it was originally intended/designed to be, what value components belong where. Or, if a subsequent Pass design improves upon this one, and I can incorporate those tweaks, that would be most exciting.
I understood that , besides asking for difference between various iterations of schematic , you're asking to check for possible previous brainless tweaks on actual amp ......
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