2X (Pomelli volume sostituibili per BT20A PRO, BT30D PRO, TB10D, BT20A e 2099
2X(The P3, BT20A, BT20A PRO, BT30D, BT30D PRO, and TB10D amplifiers are equipped with replaceable orange knobs. To replace the knobs, simply grasp the existing knob firmly and pull it straight off the shaft. ).