Sovtek replacement tubes kit for the Blackstar HT Studio 20. High gain set. 1x 12AX7LPS Sovtek, 1x 12AX7LPS Sovtek Balanced, 2x EL34 EH Platinum Matched.
Tungsol replacement tubes kit for the Blackstar HT Studio 20. High gain set. 1x 12AX7 Tungsol, 1x 12AX7 Tungsol Balanced, 2x EL34B Tungsol Platinum Matched.