This Russian-made pentode is standard on many UK amps and has great durability, although as with most Russian power tubes the break up is a bit harsh and they lack high end as compared to the true European models.

This exclusive Groove Tubes design is a close copy of classic the Mullard type with good power and flat tonal response. Unique sound, slightly edgy distortion when pushed hard. The most reliable of all in this family.

Low-rated tubes have early break-up and distortion, wide range and softer attack good for rock and blues solos. Medium-rated tubes offer normal performance, great dynamic range/attack and are the best all around rating type for all styles of playing. High-rated tubes have the most dynamic range and the most clean power/less break-up for power players, jazz guitarists and bass amps.

Country of origin: Russia