Same results in my MH trio. Amazingly responsive to mods. My latest mod was removing the ribbon cables inside and hard wiring the points. Just as big as a change.
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Sorry have to make a correction the original opamps were OPA2134 not OPA134 as I stated above and they are duals. I guess some op amps are singles like the OPA627 and OPA637. If you need to use these you have to have what I believe are called daughter boards which allow you to mount two of those chips on a circuit board which then plugs into the 8 pin socket. (yes thankfully the MH has sockets) I am thinking of changing out the op amp in my Creek OBH-11 but it is not socketed so I would have to de-solder and install a socket. Sounds dangerious with my skills ;^)
Can't recommend you install a socket unless you have both the skillset and the right stuff. Solder sucker? Solder wick? Real low power iron? Adjustable? Good, hi-end socket?
'Modified' opamp? How so? Unless manufactured from a new set of masks and with modified implant and diffusion parameters? That would make it a 'new' part. It's not like you can open 'er up and just change transistor thresholds and resistor values.
The OPA2132 / 2134 are considered pretty musical.
Try from this list....All have been used in the CMOY headphone amp with various degrees of success.