I had a window yesterday to do some quick reamp comparison of 6L6, EL34, 6CA7 tubes in my gen1 Roadster. The 6L6 and EL34's are Mesa brand, the 6CA7's are JJ's. Using Jaymz's Deliverance DI. It's not a mix, just the right-hand track. Then run into my ISO cab using a Celestion V30 16_Ohm. SM57 and Audix I5 clips. Mackie 400F for the pre's. I used the pink noise method to set mic position while eyeballing the spectrum analyzer and with headphones. MAnalyzer says the phase offset was 0.02ms. All clips are normalized to 0db in Cubase.
Here's the Mesa settings, all on CH3.
6L6:
6L6 SM57 Diode
6L6 SM57 Recto
6L6 Audix i5 Diode
6L6 Audix i5 Recto
EL34:
EL34 SM57 Diode
EL34 SM57 Recto
EL34 Audix i5 Diode
EL34 Audix i5 Recto
6CA7:
6CA7 SM57 Diode
6CA7 SM57 Recto
6CA7 Audix i5 Diode
6CA7 Audix i5 Recto
Hope this is useful.
Here's the Mesa settings, all on CH3.
6L6:
6L6 SM57 Diode
6L6 SM57 Recto
6L6 Audix i5 Diode
6L6 Audix i5 Recto
EL34:
EL34 SM57 Diode
EL34 SM57 Recto
EL34 Audix i5 Diode
EL34 Audix i5 Recto
6CA7:
6CA7 SM57 Diode
6CA7 SM57 Recto
6CA7 Audix i5 Diode
6CA7 Audix i5 Recto
Hope this is useful.