Based on Blackstar’s best-selling valve-powered HT pedal range, the Blackstar HT5 mini stack is a straightforward two-channel design with a shared EQ and a push-pull power stage based, rather unusually, on a single 12BH7 valve. Normally one output valve means single-ended pure class A, however, the 12BH7 is a twin triode with two separate amplification [...]