This Superior Blackstar HT1 Valve Kit contains one low microphonics Sovtek 12AX7WC and one Tung Sol 12AT7W. These valves are Russian and the W means ruggedised. This is especially important for the 12AT7W as it unusually is used as an output valve. This is a particularly good long lasting pair of valves/
We have had excellent feedback on this kit as it really brings this little amp alive with richer tones
These valves come fully tested by us in addition to factory testing and have 120 day warranty for manufacturing defects.