Basically what rtaylor and Hands said. There's a reason that we use one OPA1662 stage per channel in Modi, and one OPA1662 stage as voltage gain only to drive eight (8) paralleled OPA1688 stages per channel in Heresy--and the OPA1688 is rated at 75mA output current!
OPA1688 is plenty stout, but there are better (OPA1656, etc). And they all pale when compared to the 3A rated parts in Magni 3+ and 30A (yes, 30 amps) rated parts in Jotunheim R.
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