Three amplifiers symbolize the success of Unison Research: the Simply Two, the Triode 20 and the legendary Absolute. On the occasion of the 25th anniversary of the birth of Unison Research, we pay homage to these historic devices by offering the Simply Two and the Absolute in a limited and numbered “Anniversary” edition. We’ve also decided to offer a completely new version of the Triode 20 and named it, quite appropriately, the Triode 25.
The Triode 25, like its predecessor, is a push-pull amplifier that utilizes EL34 tubes in the output stage. The push-pull circuit includes a final stage with two power tubes intended for the amplification of the positive half-waves, respectively, and of the negative half-waves of the audio signal. The task of properly reconstructing the audio signal is then assigned to the output transformer which, thanks to its symmetrical structure, allows for a highly linear signal. Here are some of the more important and significant benefits of a push-pull structure in this type of amplifier design:
– Higher output power
– Higher efficiency and therefore less heat generated, with positive effects on the durability of the output tubes as well as a significant savings in energy costs
– No static polarization of the output transformer, resulting in better performance of this section.
- Output Stage: Push-pull, ultralinear, Class-AB
- Output Power: Approx. 45 watt per channel
Approx. 25 watt per channel
- Output Impedance: 6 Ohm
- Input Impedance: 47 kOhm / 50 pF
- Negative feedback: 5 dB or 1.8 dB
- Valve complement: 2 x ECC83 (12AX7) 1 x ECC82 (12AU7) 4 x EL34 (6CA7)
- Power Consumption: 300 watt max
- Fuses: T6.3A from 100V to 130V T3.15A from 220V to 250V
- Dimensions: 30 cm x 45 cm x H. 20cm
- Net weight : 20 Kg