Kevin worte me:
"In the 6922 position, you can go with the earlier Russian 6922 made in the 1970's called a 6N23. They are tubes that were sometimes branded Sovtek but Sovtek is not a manufacturer, but a name for export. They look similar but sound waaaay different. And last. These will be dynamic and not have quite as much glare as the regular later production Russian 6922. We have a "Private Reserve" grade for $25 that will have the highest Gm, anda triode balance of about 10%."
"In the 6922 position, you can go with the earlier Russian 6922 made in the 1970's called a 6N23. They are tubes that were sometimes branded Sovtek but Sovtek is not a manufacturer, but a name for export. They look similar but sound waaaay different. And last. These will be dynamic and not have quite as much glare as the regular later production Russian 6922. We have a "Private Reserve" grade for $25 that will have the highest Gm, anda triode balance of about 10%."