Suggestions for a tube pre and power amp

Lals

When 'tube rolling' often it it a single tube type by many different manufacturers or even the same manufacturer. Ken Rad was a big company. The VT231 was a military designation of a 6SN7 and made by numerous tube makers. I think the one by Ken Rad, specifically the charcoal glass ones are the bomb. 

The Atmasphere Class D uses a GaN transistor which, I think, most folks think give the best sound for a Class D. The AS are mono amps, really reasonably priced and have a smooth tube like sound. There are other GaN amps, but I have limited experience with them. And none topped the AS, IMO. 

It is fully balanced as is the Motherload XL. Balanced connections took all the background noise from my system, dead quiet 😃

@lals 

Ken-Rad only made tubes on their own until 1945 when they were acquired by GE.  Their name appeared on tubes only until the early 50's and the majority of their tubes went directly to the military.  They are a rare commodity on the market today and reputable sellers like Andy at VTS sell them for $140-200 a piece. There are far more reasonably priced and good sounding tubes still to be found for much less than the prices Ken-Rad command. 

Been very pleased with the Rogue RP-7 v2 preamplifier and a Purifi-based dual mono solid state amplifier.

++ for the RP7  great pre and responds to tube changes to taylor the sq. I have mine feeding a bhk 250.  Very musical and satisfying. 

I can recommend LTA and Coda, I have a MicroZOTL Level 3 preamp with Ray Reserve 6SN7 and 12AT7 and a Coda No.8 V1 power amp. They are very nice together, as others have said, the LTA is not a classic tube sound but a nice balance in between, open, dynamic, detailed, and very quiet.
The LTA has low output impedance but single-ended only and the Coda has high input impedance on its single-ended inputs so they match well electrically.