Ask Ralph Karsten how much he is asking for one of the several versions of his Atmasphere UV-1 preamp. It too uses 6SN7s and can be configured to your needs.
NOS ans ANOS 6SN7s in good condition are still available by the millions or so it seems on the secondary market. They really do have a specific or characteristic sound, the prices fairly low still* and therefore fun to roll.*Except for the most sought after manufactures and types, for example, the well known and worshiped 6SN7GT Tung Sol round plate. The TS round plate in ANOS quality can get about $400 +/-.
NOS ans ANOS 6SN7s in good condition are still available by the millions or so it seems on the secondary market. They really do have a specific or characteristic sound, the prices fairly low still* and therefore fun to roll.*Except for the most sought after manufactures and types, for example, the well known and worshiped 6SN7GT Tung Sol round plate. The TS round plate in ANOS quality can get about $400 +/-.