Thanks to Unison Researchs extensive knowledge of output transformer production the Sinfonia has been designed with a power stage that is made up of two KT88 valves per-channel in single-ended parallel ultra-linear configuration in which the KT88 (beam power tetrodes) operate with good approximation like an ideal triode. This configuration provides very good results in terms of sound quality however the natural drawbacks of valves (namely the non-uniform decline in performance over time due to drift) need to be addressed. So after much testing Unison Research developed an an original circuit design which through the control of the KT88 bias ensures a real-time compensation of the parameters affected by drift. This solution guarantees the best sound quality even after many years & also contributes to a slight reduction in the time it normally takes for the tubes to warm up after switching on & reach the optimal temperature. ...

Thanks to Unison Researchs extensive knowledge of output transformer production the Sinfonia has been designed with a power stage that is made up of two KT88 valves per-channel in single-ended parallel ultra-linear configuration in which the KT88 (beam power tetrodes) operate with good approximation like an ideal triode. This configuration provides very good results in terms of sound quality however the natural drawbacks of valves (namely the non-uniform decline in performance over time due to drift) need to be addressed. So after much testing Unison Research developed an an original circuit design which through the control of the KT88 bias ensures a real-time compensation of the parameters affected by drift. This solution guarantees the best sound quality even after many years & also contributes to a slight reduction in the time it normally takes for the tubes to warm up after switching on & reach the optimal temperature. ...

Thanks to Unison Researchs extensive knowledge of output transformer production the Sinfonia has been designed with a power stage that is made up of two KT88 valves per-channel in single-ended parallel ultra-linear configuration in which the KT88 (beam power tetrodes) operate with good approximation like an ideal triode. This configuration provides very good results in terms of sound quality however the natural drawbacks of valves (namely the non-uniform decline in performance over time due to drift) need to be addressed. So after much testing Unison Research developed an an original circuit design which through the control of the KT88 bias ensures a real-time compensation of the parameters affected by drift. This solution guarantees the best sound quality even after many years & also contributes to a slight reduction in the time it normally takes for the tubes to warm up after switching on & reach the optimal temperature. ...

Unison Research Triode 25 Black Valve Stereo Integrated Amplifier w/ 4x EL34, 2x ECC82 & 1x ECC83 valves together with 32 Bit DSD USB (Universal Serial Bus) DAC built-in ...

The Triode 25 was born out of the huge success of the long-standing Triode 20 amplifier & released as part of the 25th anniversary celebrations of Unison Researchs formation. Its been developed over an extended period to ensure it is a worthy successor to the Triode 20s name.  Like its predecessor the Triode 25 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 audio signal & is then followed by a symmetrical output transformer stage that reconstructs the signal into a high-quality linear wave.

...

The Triode 25 was born out of the huge success of the long-standing Triode 20 amplifier & released as part of the 25th anniversary celebrations of Unison Researchs formation. Its been developed over an extended period to ensure it is a worthy successor to the Triode 20s name.  Like its predecessor the Triode 25 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 audio signal & is then followed by a symmetrical output transformer stage that reconstructs the signal into a high-quality linear wave.

...

The Triode 25 was born out of the huge success of the long-standing Triode 20 amplifier & released as part of the 25th anniversary celebrations of Unison Researchs formation. Its been developed over an extended period to ensure it is a worthy successor to the Triode 20s name.  Like its predecessor the Triode 25 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 audio signal & is then followed by a symmetrical output transformer stage that reconstructs the signal into a high-quality linear wave.

...

The Triode 25 was born out of the huge success of the long-standing Triode 20 amplifier & released as part of the 25th anniversary celebrations of Unison Researchs formation. Its been developed over an extended period to ensure it is a worthy successor to the Triode 20s name.  Like its predecessor the Triode 25 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 audio signal & is then followed by a symmetrical output transformer stage that reconstructs the signal into a high-quality linear wave.

...

The Triode 25 was born out of the huge success of the long-standing Triode 20 amplifier & released as part of the 25th anniversary celebrations of Unison Researchs formation. Its been developed over an extended period to ensure it is a worthy successor to the Triode 20s name.  Like its predecessor the Triode 25 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 audio signal & is then followed by a symmetrical output transformer stage that reconstructs the signal into a high-quality linear wave.

...

The Triode 25 was born out of the huge success of the long-standing Triode 20 amplifier & released as part of the 25th anniversary celebrations of Unison Researchs formation. Its been developed over an extended period to ensure it is a worthy successor to the Triode 20s name.  Like its predecessor the Triode 25 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 audio signal & is then followed by a symmetrical output transformer stage that reconstructs the signal into a high-quality linear wave.

...