Can someone suggest a lush tube integrated under $3000 used

paulcreed- 20 watts is a concern with 6ohm 87db speaker even with there claim of high current.

You would drop that concern in a heartbeat if you were here for Chuxpona. We had some very inefficient 87dB monitors that were driven with some 100+ solid state watts at first because we couldn't believe the little Raven would be enough. When we switched amps to the Blackhawk those speakers came ALIVE! Anyone listening blind would swear the amps were reversed, they sounded so much better with the Raven.  

The owner was floored and wanted to see how loud they would go. "Is that as loud as it goes?" he asked. I never had to crank it like that with my Moabs, so just kept cranking until it was about 3/4. The sound was big and full and LOUD! 

I know it sounds crazy. The common wisdom keeps insisting watts are watts, no matter how many absolutely unbelievably compelling demonstrations proving it wrong. They just keep going. Like the freaking Energizer Bunny. No evidence. Proven wrong over and over again. Do a search. Read actual user comments. Lots of people have these with speakers like yours, power is simply not a problem.  

Oh and the room we were filling with volume? 17x24x9. Not small. And full of sound absorbing audiophiles at the time. I believe this is written up in my Chuxpona review as well.

Conrad Johnson is the obvious one to look at.  There's the CAV-50 and nowadays the CAV45-S2.

I watched a video on the owner/designer of Raven Audio and his thoughts on building an amp were very impressive. His philosophy reminded me of Don Allen a guy that built a preamp for me long ago that cost $800 but sounded better than some $5000 preamps I had. Don always felt not to use matching resistors and caps, his idea was trial and error with parts to find the right sound, same statement Raven audio made.

I like how Raven pre has 6 preamp tubes to stagger different brands. They claim to put some money in the preamp section which I feel a lot of other company’s cut corners on the preamp section of an integrated. Main reason I’ve not had good luck with integrated amps a have used separates. 
Can someone explain how how Raven is getting moderately efficient speakers to get loud with 20 tube watts. I have a Mapleshade Scott lk48  maybe 20 watts but it can only do so much with 6 ohm 87 db speakers. That’s why it’s in a closet, it’s great with Altec 604’s or Klipsch but anything else it falls short. 
I like what I’m seeing from Raven Audio, will look into them some more.

@paulcreed,
One thing is for sure, all 20 watt tube amplifiers aren't the same nor are 87 db sensitivity speakers (Some are simply easier impedance loads than others). Sensitivity alone doesn't present the entire picture.

Fortunately Raven Audio has a very generous 45 day home trial period.  No better way to determine if their 20 watt amplifier is right for your particular situation. 
Charles 

Another vote for the VAC Avatar - the SE version but not the Super version.