I used the Shuangung 845b with my Viva Solista. I have to say, I could'nt hear a great deal of difference between them and the basic valves that it came with.
As Casouza says, the plate voltage is very high with Viva's use of the valve. Some 845's are'nt appropriate.
If you look on Audioasylum under product reviews, one of the respondents was doing very careful reviews of the various 845 options.
As Casouza says, the plate voltage is very high with Viva's use of the valve. Some 845's are'nt appropriate.
If you look on Audioasylum under product reviews, one of the respondents was doing very careful reviews of the various 845 options.