Pubul57, the tube preamps were the reference Lamm, Hovland HP-100 and Audio Research's reference before the Ref 3.
What you might find interesting is that I was discussing preamps with a dealer who is a tube "maven" about what would be worth auditioning in his opinion. When I asked him what preamp he uses in his home system, he laughed and said the Placette active line stage! He believed that it offered the best performance, even if it was not a tube based linestage. He also shared that all of his clients that auditioned the Placette kept it and traded in their tube preamps.
What you might find interesting is that I was discussing preamps with a dealer who is a tube "maven" about what would be worth auditioning in his opinion. When I asked him what preamp he uses in his home system, he laughed and said the Placette active line stage! He believed that it offered the best performance, even if it was not a tube based linestage. He also shared that all of his clients that auditioned the Placette kept it and traded in their tube preamps.