Manley Chinook with (very) low output MC ZYX?

Sorry, instead of RPMs, I refer to Op Amps.  I was messaging by voice and Siri screwed up Op Amps into RPMs.

A quote from Mrs. Eveanna Manley on the Chinook TI op amps: “Those opamps are performing as a DC voltage servo in order to bias the FET operational point. Those opamps are not in the signal path. They just stabilize a DC voltage needed to set the operational point of the FETs”.

@lewm - Sounds like you would be correct regarding them having little  effect on sound.  

Thanks, JT. FWIW,  I think Evanna goes by “Ms”, not Mrs. Sometimes we swap out parts just because it gives a feeling of control. But without a schematic and the proper knowledge, it’s a crap shoot. Manley won’t give out schematics even to professional repair businesses;, not that there’s anything wrong with that. It actually makes sense from their point of view.

yep, that is correct. not in signal path but are DC servos for FETs.

lowers the noise floor a ton. The other thing you can do is change out all the loading resistors on the back panel to Vishay VSRS.  just like focusing the looking glass much better imaging, quieter backgrounds and micro dynamics much better.
I would attach some photos but can't do it with Agon forums.

I agree that Vishay nude resistors (I don't know about "VSRS";  I do know about nude TX2575, which can be ordered on-line) will be superior to the stock phono load resistors in the Manley phono stages.  The TX2575 are superior to just about any resistor ever.  However, on the subject of the op amps, was there ever an audible "noise floor" to begin with?  I find the Steelhead to be intrinsically very quiet even at full volume.  Further, in most cases where there is an op amp used as servo, the device is bypassed by a capacitor or two, just for that reason to render the op amp inaudible.  When or if the op amp is intrusive, one cure is to increase the value of the bypass capacitor(s).  But I don't hear it, assuming the Steelhead, like the Chinook apparently, uses op amps as servo.  Finally, the Steelhead is so full of parts that I am loathe to get in there with my soldering iron, except to change the phono load resistors, and in my case to change the output stage, since that part of the circuit is quite accessible.  A lot can be achieved with a little effort on the output stages.