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:
To ensure high quality sound in an amplifier with a push-pull configuration, however, it is essential that all individual amplification stages, especially the two semi-output amplifiers, are carefully designed and constructed to prevent the formation of dangerous and compromising odd-order harmonic distortion. This is even truer for the output transformer.
The new Triode amplifier 25 has experienced a long and painstaking design and testing period despite the considerable experience already gained in the construction of its predecessor, the Triode 20. The Triode 25 can operate in two modes: triode and pentode. The latter is capable of delivering a maximum power output of over 45 watts per channel with a load of 6 ohms with harmonic distortion extremely contained across the entire audio band.
|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|
Four more than four decades Trutone Electronics has been proudly serving the Greater Toronto Area with the greatest asset any specialty audio video dealership possesses: a well informed, experienced and knowledgeable sales staff. Our location in Mississauga is able to assist you in creating a smart home automation system, distributed audio throughout your home and yard, or dedicated home theatre. Trutone's carefully chosen product lines include surround sound receivers, loudspeakers, televisions, custom remote controls, audio video furniture, room acoustic controls, headphones, bluray players, projectors, and screens.