@jimkiely,
I'm completely satisfied with my Luxman EQ-500 and (2) NOS Brimar CV4003 and (4) ECC83 Gold Lion tubes. I left the EZ81 stock tube in place. I use Nordost Heimdall interconnects from my EQ-500 to my Van Alstine Audio FET Valve all vacuum tube preamp with NOS Mullard tubes. I get pinpoint imaging, and deep layered and wide soundstage. The mids are as good as I've ever heard. The bass is deep and articulated, and the highs are extended but not fatiguing. It's a fantastic phono preamp and I have no urge to upgrade after owning it for about 2 years.
I'm completely satisfied with my Luxman EQ-500 and (2) NOS Brimar CV4003 and (4) ECC83 Gold Lion tubes. I left the EZ81 stock tube in place. I use Nordost Heimdall interconnects from my EQ-500 to my Van Alstine Audio FET Valve all vacuum tube preamp with NOS Mullard tubes. I get pinpoint imaging, and deep layered and wide soundstage. The mids are as good as I've ever heard. The bass is deep and articulated, and the highs are extended but not fatiguing. It's a fantastic phono preamp and I have no urge to upgrade after owning it for about 2 years.