just purchased wyetech vacuum tube mono amps that each use 2 300b tubes. think the tubes are starting to go over the hill. distorts at moderately high volume on 98 db efficient 16 ohm horn speakers. reading about 300b tubes and hard to get a feel which brands/ones are reliable, sound great and hopefully not too expensive since would be replacing 4 tubes. ones of interest include Sophia classic, eml xls (though some have brought up reliability issues), shuguang treasure, genalex gold lion, tj full music, svelana, Elrog, acme (like in wil e coyote).
any experiences with these would be appreciated.
thank you.