Signature has been the standard version for a long time now, as I understand. Upgrade is F1, with or without direct coupling.
You can tune the sound a lot by selecting output impedance match (4 vs 8 ohm) and ultralinear vs triode sound, as well as tube selection.
Art
You can tune the sound a lot by selecting output impedance match (4 vs 8 ohm) and ultralinear vs triode sound, as well as tube selection.
Art