Has anyone done an extensive study on the differences in the sounds of the Russian 6n23p-ev ‘s that are made at the different factories in Russia, and the time period in which they were made to be able to recommend which tubes are the best sounding. There is Lao a difference in the getters on the tubes, from a double getter, to a single getter, that looks like an upside down flying saucer. What’s the difference in the sound of these differences?
6h23P-EB vs 6922 in the input stage of the Wolcott or other tube amplifiers
In one of the publications, 6h23P-EB tubes were suggested as replacements for the standard 6922 in the input stage of the Wolcott 220 monoblocks. I've noticed discussion on preamps, but was wondering if anyone had experience with this input stage replacement in ether the Wolcott or other amplifiers?