I was impressed with my McIntosh MA2275 integrated once I installed Siemens ECC801S's in the 12AT7 slots. The Siemens, IMO, are noted for their tight, heavy bass.
Tube Integrated with deep bass
As the subject states I'll like to know of any good tube integrated with deep, tight bass. To some this could sound like on oxymoron but the truth is some Vintage equipment do have deep bass. I'm looking for new equipment, no vintage.