The Regal II is a pure, single-ended class A design that utilizes a new "Adaptive Transformer Technology" that allows for the use of one or two power tubes at the same time. Therefore, operating power is rated from 5 watts to 35 watts; and at 5 watts, it's a REAL 5 watts, not some squashed approximation of 5 watts. The Regal II is designed around a custom bifilar output transformer that is essentially two discrete transformers driving a common speaker load. This allows for the use of any combination of common 8 pin power tubes - from a single 6V6 delivering 5 watts of pure class A power, to two EL-34's for 35 watts. And because each tube is relating to its own independent transformer winding and bias resistor, any combination of different tubes types can be auditioned. Whether it be a single 6V6 or 6L6GC or a combination of the two (yes that's right, a 6V6 and a 6L6GC at the same time) the Regal II never needs biasing or adjustments when changing tubes. This versatility is also extended to rectifier tubes; the Regal II can accept any common 5 Volt rectifier including 5Y3, 5V4, 5U4, and 5AR4 with no adjustments nessessary.