One Valov Siemens ECC81 / 12AT7 Preamp TubeNOS / NIBCode: VF4 = ECC81Code: ‡7H = Siemens 1967Small O Halo GetterBMV+dg 468 Stamp on GlassThis tube has matched sections and is considered a balanced tube Good Gm Range: Minimum 3,500 and average new 5,400This tube tested at 4100/4100 Gm and 7.6/7.6 mANo noise, leaks or shortsGoes Great With:Fender Super Reverb - Super Reverb Phase Inverter position V6Ensemble Evocco Integrated amp 1998Fender 65 Twin ReverbInv. 7-1 77341715