Jadis JA30 MKII, a pure class A 45 watt per side amplifier, is a very effective monoblock. Each tube is protected by a fuse and is self-biasing even when tubes are replaced, no adjustments are necessary. Output tubes can be either KT8,6CA7, KT120 or KT150S and the amps are designed to deliver full power at 15Hz, making for extraordinary bass.