rafafredd
Well-known member
There should be some advantages to use an alternative GRID for ControlVoltage in a VariMu compressor, like not needing a center tap on the input transformer secondary, sidechain not interacting with the transformer winding capacitances and resistances, and maybe even trying a transformerless VariMu.
Has anyone ever tried to control gain of a Pentode (or maybe Hexode / Heptode) by running the CV to G3 (or G4, G5???). Maybe even G2 with a buffer, I don't know.
If you did this, what were your findings?
Did it work well?
How does it impact tube performance?
Did you set G3 to 0v with signal grid (G1) and aplied negative voltage to gain reduct or did you go from a positive voltage like 18v and applied control voltage down to zero?
I don't really understand how the tube will work with G3 (or other grids, like in a pentagrid) in positive and negative potential in relation to G1, so I'm really afraid to just try it and burn some tubes, or worst, blow some big caps or starting a fire.
So... before I start experimenting with high voltage setups, any hints about how the effects of CV on these non traditional grids will bend the tube curves?
As always, thanks on advance for any inputs and discussion.
Has anyone ever tried to control gain of a Pentode (or maybe Hexode / Heptode) by running the CV to G3 (or G4, G5???). Maybe even G2 with a buffer, I don't know.
If you did this, what were your findings?
Did it work well?
How does it impact tube performance?
Did you set G3 to 0v with signal grid (G1) and aplied negative voltage to gain reduct or did you go from a positive voltage like 18v and applied control voltage down to zero?
I don't really understand how the tube will work with G3 (or other grids, like in a pentagrid) in positive and negative potential in relation to G1, so I'm really afraid to just try it and burn some tubes, or worst, blow some big caps or starting a fire.
So... before I start experimenting with high voltage setups, any hints about how the effects of CV on these non traditional grids will bend the tube curves?
As always, thanks on advance for any inputs and discussion.