I spoke with Andy at Vintage Tube at length regarding Mullard, since I was looking for the very best, most holographic tube that Mullard offered. He stated that the ECC82/12au7 Boxplate and the Longplate O-Getter 1950's had the finest sonics and measured as lowest noise.
The CV4003, also Blackburn, is not as extended and he thinks is a lesser grade tube; (1970's). Kevin at Upscale disagrees.
Google Joe's Tube Lore and read his findings after testing many brands and tube types.
The CV4003, also Blackburn, is not as extended and he thinks is a lesser grade tube; (1970's). Kevin at Upscale disagrees.
Google Joe's Tube Lore and read his findings after testing many brands and tube types.