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Originally Posted by Radio Wrangler)
Note that J3 isolates the bias to BOTH output MOSFETs together at once, J4 isolates the bias to the driver MOSFET. You can't use them to look at the partitioning of current between Q45 and Q46
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Ouch, that's right. That's a major difference between this and the V3 chassis. Or is it? Just going to have a look now. Thanks for pointing that out, RW. (That's why we need you).
Edit: ...Yes, the V3 version of this chassis has separate links for disabling the bias to the output MOSFETs and also separate bias presets for each output MOSFET, as well as a third bias setting preset for the driver. Seems like a backward step to have combined the adjustment for both output MOSFETs in this version. We'll let crackle go ahead just in case it is actually the driver which is drawing all the current (unlikely, but...).