To try the P5 with the LSA turn the LSA's volume pot to 100% max (effectively removing the pot from the circuit).
Connect via line inputs as previously mentioned.
I would also try running the LSA solo for awhile to see if the sound opens up/improves.
Onother option (after running the LSA for a week, or so) would be to test and possibly replace/upgrade the preamp section tubes.
The sound of various 6922 tubes is all over the map, from my experience, using them as input and/or preamp tubes.
Connect via line inputs as previously mentioned.
I would also try running the LSA solo for awhile to see if the sound opens up/improves.
Onother option (after running the LSA for a week, or so) would be to test and possibly replace/upgrade the preamp section tubes.
The sound of various 6922 tubes is all over the map, from my experience, using them as input and/or preamp tubes.