LUXMAN L509X VS M700/C700U

Get a CL-38 vacuum pre to pair with solid state amp. This is commonly done to sweeten the sound of a cold SS amp. This may also tone down those horn tweeters on triangles. 
Alternatively, Sell the m700 and get a full tube set up, MQ-88 and CL-38. Paired with your DA-06 you’ll have a world class system that would suit your triangles. Sound of tube separates, IMO would be sublime with bright triangles.
Keep the m700 so you can compare before you cull it. Get the integrated if you have space limitations. 

I think OP will replace oppo with luxman Dac. Seems most agree all tube set up will be ideal. 
Agree with mastersound recommendation, best tubes I’ve ever heard as well. They are 
very hard to find on a used market though. I’d stay away from integrated if above tube set up is an option. Is audition possible ?

 “What do guys think about cl 38uc and combine it with m700u with triangle speakers ? Vs c700u” 


I think CL-38 should sound better with 700u and triangle. 
What makes the SS preamp c700u 50% more expensive than CL-38? Has anyone compared the aforementioned preamps?

Did you end up getting the CL-38? How is it? 

What are you using for the source? I assume you've got the Luxman Dac. 
Are you able to audition Luxman Tube amp? Do you have a power conditioner? What speaker cable do you have?