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its not just about the valve unless each is run with the same efficient speaker. 845 and 211 are good but I haven't tried them with my speakers and at 118db there would be little point. 2A3 was good for a number of years running mid compression drivers but to be fair would not do great bass with such small iron ( bottlehead ) 300B with Emission Labs 300B-XLS does most things right with mid driver from 350Hz -2Khz. Better iron on J Sound Labs 300B. My latest purchases are russian tubed 6n6C ( 6P6C ) and another amp 6p3P only tried on fostex single driver and CSS single driver speakers but so far promising.
Among 300b, Takatsuki for sure. My second choice would be Sophia Royal Princess.
You might consider the new 300b offering from Living Voice. Western Electric duplicates that are better than original WE. Made by KR for Living Voice.charles
CharlesDo you have a link to the KR 300b for Living Voice? Or a source?ThanksGary
The original WW2 WE 300B lasted around 40K hours.Edited for correction.