Hello Charles,
I feel extremely fortunate to have scored the older NOS Mullard High Wycombe CV378 "Fat Bottle". I spoke with Israel about this tube as well as "skinny bottle"; he was very enthusiastic about this tube plus liked the slow start. I read Dubstep Girl review of 5U4GB and their equivalent tubes. I must say she is accurate in her assessment on the brands I have tried. Dubstep was reviewing with a Woo headphone amp, so not apples to apples, but it worked out alright. Yazaki-san likes the NOS GEC and Marconi types like U52, for example, as well as some others. Yazaki-san sent Jeff Day a really nice NOS 5U4G rectifier under the Haltron banner, but since they never made their own tubes I wonder what it is? I'll have to ask.
I feel extremely fortunate to have scored the older NOS Mullard High Wycombe CV378 "Fat Bottle". I spoke with Israel about this tube as well as "skinny bottle"; he was very enthusiastic about this tube plus liked the slow start. I read Dubstep Girl review of 5U4GB and their equivalent tubes. I must say she is accurate in her assessment on the brands I have tried. Dubstep was reviewing with a Woo headphone amp, so not apples to apples, but it worked out alright. Yazaki-san likes the NOS GEC and Marconi types like U52, for example, as well as some others. Yazaki-san sent Jeff Day a really nice NOS 5U4G rectifier under the Haltron banner, but since they never made their own tubes I wonder what it is? I'll have to ask.