I changed original tubes of the beast by "Tung-Sol 12AX7 / ECC83 Reissue BALANCED" and "Sylvania 6V6 GT / VT-107A, USA NOS TT XT-Matching".
Some profiles with the E906 and other with SM57 
VHT special 6 Profiles (other tubes)
- Ptitduke
- Closed
I changed original tubes of the beast by "Tung-Sol 12AX7 / ECC83 Reissue BALANCED" and "Sylvania 6V6 GT / VT-107A, USA NOS TT XT-Matching".
Some profiles with the E906 and other with SM57