Tungsol replacement tubes kit for the Engl Invader 100. Standard set, selected for best all-around sound upgrade. Special selection set: uses KT77 tubes for punch and sparkling clarity. The set includes the following tubes:
3x 12AX7 / ECC83 Tungsol
1x 12AX7 / ECC83 Tungsol Balanced
4x KT77 Platinum Matched
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