We are selling this beautiful pair of Thrax Audio Teres 250 Watt Hybrid mono block amplifiers. This pair is a customer trade in who recently traded them back into us and upgraded to the Thrax Audio Spartacus Monoblocks. They are in like new condition and work and sound flawless. These are amazing amplifiers. They are incredibly musical, dynamic,fast and natural sounding. please see technical data below.
Teres is based on the architecture of Spartacus. Single ended tube input stage loaded with a phase splitting transformer controlling 2 separate single ended amplifiers out of phase for output. Tube clarity and tone with might and power. Unusual but true..
The C3g tube handles all the voltage gain needed. It uses a new generation or our choke rectified shunt regulated power supply. providing a stable noise free operating point.
The output stages power JFET cascodes form a bridge that when unbalanced by the input signal via the 2 transformer windings restores balance by adjusting their current conduction trough the load. The 2 output stages actually enclose the load in their control loops and try to correct each others errors reducing the distortion to negligible amounts. Leaving only the “character” of the input stage.
To reduce the amount of heat generated the amplifier is biased so only the first few watts are in true class A. Music has a crest factor of 10 on average. This means that most of the time we listen with 1/10th of the peak levels. For most users this translates to under 5W. Peaks could reach over 100watts during playback, but only for few milliseconds. For those peaks the amplifier switches to class B using only one leg of the output stage capable to deliver up to 250W/8ohm and 350w/4ohm.
Not sharing a common reference point apart from the load itself makes the second leg correct for any error produced by the first one. Result is an amplifier capable of extreme power wile delivering exquisite smoothness and low level resolution.
The driver stage is isolated by the interstage transformer and is not influenced in any way by the output stage maintaining tone colour and resolution at all powers and loads.
Having the output stages floating around the load prompted for the use of a unique biasing technique powered by solar cells. This was the quietest galvanically isolated power we could come up with. Using opto-electrical conversion we control the bias by adjusting light intensity in the control circuit.
Teres is an example of modern technology solving age old problems allowing us to go a step beyond.
The physical appearance of Teres is typical Thrax understated elegance. Exquisite finishing ads to the presentation of a solid block of metal like a bigger brother of Heros.
- Tube amplifier architecture with simplest signal path - Transformer coupling of stages
- Special grade screened power transformer - Jfet/Mosfet cascode output devices - Silicon carbide rectifiers - Microprocessor control - Audiophile super long life C3g Input tube
- Shunt regulated power supply
- Solar cell bias of Output stage
- Battery bias of Input stage - Both RCA and XLR inputs - Compact chassis built like a elegant tank - 250W/8Ohm 350W/4Ohm - Zero feedback design
- Finish: Silver anodized aluminum fro more info please feel free to contact us at Audio Limits Phone: (702)299-0567 website. www.audiolimits.com