#1
Is it necessary to bias power tubes when changing tube brand but not tube type? (Example: Sovtek EL84s to JJ EL84s)
Thanks!
#2
What amp is it?
If it's fixed bias, you should be able to swap straight out as long as you use the same type (EL84's in your case).
For an amp which requires biasing, it's usually a good idea.
Call me Wes.
Gear:
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator
#3
^ Yes because no 2 tubes are the same. Some require more or less voltage. The difference is less big if you use the same type of tubes, but it's always a good idea to have it biased. The tubes will live longer.
Jackson KV 2, Jackson COW 7 (both in B), Jackson Demmelition V
Bogner Überschall (blue rev)
Marshall 1960B Vintage (2x V30 & 2x G12T75)
TC Electronic G Major
BBE Sonic Maximizer 422A
Weber Mass 150w
ISP ProRackG
T.Racks Dinopower
#4
Quote by heavy-metal-eh
Is it necessary to bias power tubes when changing tube brand but not tube type? (Example: Sovtek EL84s to JJ EL84s)
Thanks!


Assuming you can adjust the bias on your amp; You don't need to, but it's a good habit to get in to. Any tech worth his salt will always do it. But if you're at a gig and need a replacement quickly, you can get away without an adjustment, just do it later on.
#5
Nope, doesn't matter what brand as long as it's the one that the amp came with (E.g El84)

If your amp is cathode bias (i think thats how it's spelled) you won't need to rebias it.