violindave
Inspired
The actual amp has two modes pentode and can switch to triode. I don't see that on the Fractal amp. Am I missing where to find it?
Is that just about the choice of tubes?The actual amp has two modes pentode and can switch to triode. I don't see that on the Fractal amp. Am I missing where to find it?
It's about using all 5 pins (pentode) or only 3 pins (triode) of the (same) power tubes.Is that just about the choice of tubes?
I'd probably try the Master Volume Trim in the Advanced page of the Amp block.It’s a power reducing feature that if I remember correctly (I used to own one and talked to Steve Carr about this, but it’s been some years) just shuts off part of each power tube instead of turning one off completely. Apparently that sounds better. So essentially it just lowers the output power and the headroom a bit. The real amp doesn’t have a master volume, so I’m sure you could replicate the effect with the available master in the ideal settings.
First we need to know which setting was used when modeling.I’ve had an FM9 for like 2 weeks, so I’m sure you’d know better than meI’m just pretty familiar with how Carr does things and know that it’s his way of avoiding a master volume.
Yeah that’s something the OP is going to have to play with, I was just trying to help. But if it was modeled in full pentode mode (most likely) then reducing the MV (which the amp doesn’t have) by half (like down to 4-6) would reduce the headroom considerably and would cause that thinner, earlier breakup that triode mode would cause. I haven’t had enough time to play with any of those real advanced settings yet, but old school amp settings I know. Hopefully the OP finds the settings they’re looking for.First we need to know which setting was used when modeling.
Lowering MV would be opposite (I think) of going from pentode to triode. It will have more headroom because you're reducing the input.
Increasing MV Trim would reduce the headroom.
Reducing MV doesn't reduce headroom, it increases it.Yeah that’s something the OP is going to have to play with, I was just trying to help. But if it was modeled in full pentode mode (most likely) then reducing the MV (which the amp doesn’t have) by half (like down to 4-6) would reduce the headroom considerably and would cause that thinner, earlier breakup that triode mode would cause. I haven’t had enough time to play with any of those real advanced settings yet, but old school amp settings I know. Hopefully the OP finds the settings they’re looking for.