Tungsol replacement tubes kit for the Marshall 900 series (all models that shipped with EL34 tubes). Standard set, selected for best all-around sound upgrade. The set includes the following tubes:
2x 12AX7 / ECC83 Tungsol
1x 12AX7 / ECC83 Tungsol Balanced
2x EL34B Tungsol Platinum Matched
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