Tung-Sol Sovtek Tube Upgrade Kit For Fender EC Vibro-Champ Amps 6V6GT 12AX7 5Y3GT This set includes (1) Tung-Sol 6V6GT power tube (1) Tung-Sol 12AX7 preamp tube (1) "Gain Balanced" Tung-Sol 12AX7 preamp tube marked with yellow "Balanced Triodes" Sticker (1) Sovtek 5Y3GT rectifier tube