tony777 said:FYI: Simul class mode is both class a/b and class a.
Class a mode is (you guessed it) only the two outer tubes on, what it does is that it turns the middle tubes which runs in class a/b off.
Absolutely, they are switched off, it's only the heater that glows.emperor_black said:tony777 said:FYI: Simul class mode is both class a/b and class a.
Class a mode is (you guessed it) only the two outer tubes on, what it does is that it turns the middle tubes which runs in class a/b off.
I've always wondered what happens to the middle tubes in Class A. So, is it correct to say, I can lengthen the life of the middle two tubes by running the amp always in Class A?
tony777 said:FYI: Simul class mode is both class a/b and class a.
dwsabianguy said:Well, true Class A or not, it sounds good to me. But I know what you're talking about with the Class A mode not really projecting, it's very quiet when compared to full Simul-Class. But you can get some really cool power amp distortion without blowing your eardrums.
I tend to use SC and switch between Triode and Pentode on my Mark IV, but it's fine to use any of them.
gts said:Maybe you can do this in with SOB but do not do this with a Simul-Class Mark series amp!!sultan_of_sound said:I have an '85 SOB w/SC....
You can also pull out the two Class-A tubes and run it in pure Class-AB (60 watts) for a third tone option (SC switch ON). Won't hurt the amp.
With a Mark you could pull the two inner tubes and run it in "Class A" mode (uses the two outer tubes only).
You need all 4 power tubes in their sockets to run a Mark in Simul-Class.
gts said:Maybe you can do this in with SOB but do not do this with a Simul-Class Mark series amp!!sultan_of_sound said:I have an '85 SOB w/SC....
You can also pull out the two Class-A tubes and run it in pure Class-AB (60 watts) for a third tone option (SC switch ON). Won't hurt the amp.
With a Mark you could pull the two inner tubes and run it in "Class A" mode (uses the two outer tubes only).
You need all 4 power tubes in their sockets to run a Mark in Simul-Class.
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