Tube amps under $7500

The ARC VT80SE is a fully balanced amp so it fits your specifications.  I don't consider it a warm sounding amp, but that is a very subjective judgment.  I have never heard the Lab 12 Suara, but, nothing in the description suggests that it is fully balanced.  Just because a component has balanced input jacks does not mean it is fully balanced (the jacks might be there as a convenience).

@auroravengeance 

Yeah, not sure myself.  Have only heard Lab12 at audio shows, so really hard to tell.  I did see a Part-Time Audiophile review that suggested the integrated was somewhat “warm” and “tubey”, but definitely YMMV.  I’m a big fan of some of the European and Japanese niche companies out there that provide alot of value for $ (e.g., Synthesis, Triode Corp., Lab12, Audio Hungary, Fezz Audio, etc.) Hard to go with ARC, VAC, BAT or CJ and meet the OP’s budget.  Me? I have 3 tube integrateds: Synthesis, Leben, and Triode Corp.  

@mdalton I would use the word 'vivid' to describe my Lab12 and also Jadis. They give a bold first row live music experience type that demands your listening attention. I agree that more niche brands tend to give incredible value of money. I still think my Lab12 is as good or better than anything in the market below $20000. 

@larryi You are correct that Lab12 Suara (and Integre 4 MKII2) do not have balanced input, despite having XLR input. 

There are a couple more options that OP can consider. An used Air-Tight ATM-1 would be exactly what he is looking, minus the balanced input. I've heard good things about Luxman MQ-88UC as well. 

1961 MC240….. mostly black n chrome…no biasing but no XLR…..

Have fun Hickamore

@hickamore,

See Atma-Sphere M-60 mono amps, automatic bias - no adjustment needed and true balanced differential design! Colors: black brushed anodized, silver brushed anodized, gold brushed anodized. Have fun 😎

Mike