Young Angus
Kometose Tonologist
Okay i know next to nothing about tubes and i want to retube my ENGL Savage120...hopefully myself as a learning experience and as a money saver. And i am okay with electronic stuff and my dad can help me as he is a broadcast engineer and knows tonnes about electronic gear, so i "shouldnt" get hurt 
Hopefull retubing the amp will fix this darn thing. I need to learn about biasing and stuff though because ive heard that even if you swap the tubes for exactly the same ones, only newer, you still have to set bias or something. Like i said...i know nothing.
I just had the amp open for the first time after learning something about valves, and i found that the power tubes are in fact 6550B's, not the kt88's i previously thought.....derrrr
And the preamp tubes are as follows:
V1 - 12AX7A (no brand, just big red writing)
V2 - ??? looks the same as the rest but with no label.
V3 - 12AX7A (no brand, just big red writing same as V1)
(all v1,v2,v3 have no brand, just the type of valve in big red letters on v1 & v3 and no label at all on v2)
V4,V5,V6 - all GT Groove Tube 12AX7's.
and of course V7 & V8 are 6550B's and while there isnt a brand these power tubes say "made in russia".
So what types of valves should i get. Brand wise, and also someone suggested i get 6550C's..how are they different to 6550B's? And what do i need to do in the way of setting up the amp once i replace the valves?
All help and advice is much appreciated, thank you all in advance
Hopefull retubing the amp will fix this darn thing. I need to learn about biasing and stuff though because ive heard that even if you swap the tubes for exactly the same ones, only newer, you still have to set bias or something. Like i said...i know nothing.
I just had the amp open for the first time after learning something about valves, and i found that the power tubes are in fact 6550B's, not the kt88's i previously thought.....derrrr
And the preamp tubes are as follows:
V1 - 12AX7A (no brand, just big red writing)
V2 - ??? looks the same as the rest but with no label.
V3 - 12AX7A (no brand, just big red writing same as V1)
(all v1,v2,v3 have no brand, just the type of valve in big red letters on v1 & v3 and no label at all on v2)
V4,V5,V6 - all GT Groove Tube 12AX7's.
and of course V7 & V8 are 6550B's and while there isnt a brand these power tubes say "made in russia".
So what types of valves should i get. Brand wise, and also someone suggested i get 6550C's..how are they different to 6550B's? And what do i need to do in the way of setting up the amp once i replace the valves?
All help and advice is much appreciated, thank you all in advance
