I have a Tonex capture I’ve created of my Mesa Mark III simul class power amp that sounds great when I put my Mesa Studio Preamp through it:
Mesa Boogie Mark III Simul Class Power Amp
www.tone.net
I also have a capture of the Studio Preamp here:
Lead Channel - Moderate Drive
www.tone.net
Here’s one with the Studio Preamp feeding the Mark III power amp:
Studio Preamp through Mesa Mark III Simul Class Power Amp
www.tone.net
Thanks again for these! I messed around with these a lot last night with interesting results.
I put the Tonex in the HX Stomp’s FX loop and setup four parallel presets on both units: 1 with the HX Stomp providing the preamp and the Tonex with your power amp capture,
1 with the HX Stomp providing the power amp and Tonex with your preamp capture,
1 with your preamp+power amp capture,
and 1 with the Cali IV Lead amp block in the Helix alone.
For the Helix preamp, I used the Cali IV Lead preamp block and got it sounding very close to your preamp capture (with no power amp sim or IR when comparing) and level matched them.
For the Helix “power amp”, I used the Archetype Clean amp block + an EQ block for a flat response, and took a little high end off and added a little crunch to match your power amp capture, and level matched that too.
All four presets had the same IR.
I got presets 1 and 2 sounding VERY close and feeling great. The biggest difference was that the Helix preamp always stayed brighter when pushed by a boost, whereas the Tonex preamp felt a bit more natural there.
Preset 3 had a different sound in general (iirc your listed EQ settings were different on this capture vs the preamp capture too). The most noticeable thing as far as good/bad was how pushing its gain was much more “full” sounding. I think this was just the nature of the power amp being pushed by the preamp irl, which is a bit hard to simulate with how I was running things in presets 1 and 2. I did some experiments with preset 1 (HX preamp and Tonex power amp) where I had a footswitch that both activated a boost before the preamp and upped the gain a little on the Tonex, and that got closer. I think I could get similar results with different gain staging and Tonex input trim settings too.
Preset 4 sounded the worst of the 4 and tbh I didn’t spend much time on this. I’m no Mesa expert though, so I probably could have done it better, but it wasn’t really the point of this exercise lol
Anyway, thanks once more for these captures. It was really cool to be able to get similar results with the first three approaches. Now I just need to get an actual tube preamp to try

I don’t actually own a tube amp anymore currently lol