Svetlana Tube Descriptions

[kd]

At several of the musical supply houses I've seen the descriptions soft/red, medium/green and hard/blue applied to some of the Svetlana tubes. Anyone known what this means as applied to the tubes?

Ken

[echuta13]

Just a wild guess but vacuum?

[rjgtr]

Its probably the rating for the biasing of the tubes. Tubes with lower biasing are easier to overdrive. Tubes with higher biasing points are harder to overdrive.

[kd]

Thanks fellas. Looks like Richard is right, according to what I was told when i called, it has to to with when the tube breaks up.


Ken