i'll try and help--i dont own tube hifi but ive owned lots of tube guitar amps over 20yrs..
if a output tube goes early on deffo check the bias and change the tubes in a QUAD i wouldnt just change one---if ya cant find a quad buy 2 matched pairs and put one tube from one pack in first then next to that put one in from the other pack soforth---i change my power tubes once a year frequent use if i use the amp more than usuall in a year i change them in 9 months time.......
pre amp tubes last a lot lot lot longer so you probally wont want to change them unless you feel you must(anyways they aint exspensive unlike pwr tubes)
check out a guitar magazine/paper called ''vintage
guitar'' and there are so many ads from places that sell all sorts of tubes in quads pairs ect JJ,SOVTECK,SVETLANA, ECT ---in my own experience i thought the russian tubes sounded a bit better than the chinese tubes like RUBY...
some help maybe..cheers
if a output tube goes early on deffo check the bias and change the tubes in a QUAD i wouldnt just change one---if ya cant find a quad buy 2 matched pairs and put one tube from one pack in first then next to that put one in from the other pack soforth---i change my power tubes once a year frequent use if i use the amp more than usuall in a year i change them in 9 months time.......
pre amp tubes last a lot lot lot longer so you probally wont want to change them unless you feel you must(anyways they aint exspensive unlike pwr tubes)
check out a guitar magazine/paper called ''vintage
guitar'' and there are so many ads from places that sell all sorts of tubes in quads pairs ect JJ,SOVTECK,SVETLANA, ECT ---in my own experience i thought the russian tubes sounded a bit better than the chinese tubes like RUBY...
some help maybe..cheers