Thunderbird Dual Mono – fully integrated tube-type Push-Pull amplifier (AB class) working in two completely separated audio and power tracks. The appropriate design ensures that it can cooperate with the sources of a line signal (eg CD, DAC) without the need for an additional preamplifier at the same time not excluding its use. 

Thunderbird Monoblock – Push-Pull tube power amplifier (AB class) with two monoblock construction. Each audio channel (right and left) is operated separately by a single mono amplifier made in its own housing. The design of each block refers to the architecture of the single channel of the Thunderbird Dual Mono amplifier, however, the separation of the electronics of the right and left channels in separate housings ensures the best separation.