[viggen]

spent a few days with OPA134P and find it to be a big improvement over the 5534.

i also received Muses02 and the aforementioned LME49720.  but, i can only confirm that this preamp doesn't work with dual op amps.  a bummer especially since some have reported to use it fine.  and, some ads on ebay/ali have 6010D preamps using dual op amps and some use 5534/5532 mix. 

[viggen]

So I received the dual to single op amp adapters and can confirm they work. 

I first installed a pair of the Muses02 in the 2 op amp position near the front of the preamp.  This resulted in a warmer sweeter sound.  The 1543 dac I have is already warm and sweet but adding the Muses02 didn't bloat or over sweeten.  It provided a more layered warmth instead.  I really like this sound. 

I then installed 4 pieces of the LME in the 4 op amp positions in the square pattern replacing 4 pieces of OPA134P.  This resulted in a subdued sound.  Perhaps too dark with the 1543 dac.  I switched to a Monarchy 1704 dac and this is a much better pairing.  It has an intimate but bigger, detailed, airy sound. 

I like the LME/1704 sound but I prefer the 1543/OPA134P's sweet sweet tone.

Just received a Truth preamp a few days ago.  Did a quick comparo and my wife said the clone sounds better.

[Jon L]

spent a few days with OPA134P and find it to be a big improvement over the 5534.

Since you have 5534/32 laying around, you might want to experiment with "pararelling" two on top of each other. 
In the youtube video below, I was shocked to hear how 5532 sounded the worst to me, but paralleled 5532 sounded one of the best, even among very pricy discrete op amps 

https://youtu.be/kNDX7SCN6Jc?si=GnqoVgJWOEpO436G&t=3692

[viggen]

hi Jon.

i damaged too many things with my soldering iron... have you tried doing this? 

i do like the muses 02 the most but i heard it thru my tv speakers. 

the parallel 5532 probably came in second.

[Jon L]

hi Jon.

i damaged too many things with my soldering iron... have you tried doing this? 

i do like the muses 02 the most but i heard it thru my tv speakers. 

the parallel 5532 probably came in second.

I did just place an order for Fosi V3 monoblocks on Kickstarter.   If I don't change my mind (too many amps already), I will piggyback NE5532 together.  This idea is apparently a scientific, legit idea, and Burr-Brown even had a document about it.