Thrax Teres Stereo MkII : 150w hybrid stereo power amplifier
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Thrax Teres Stereo MkII : 150w hybrid stereo power amplifier
Product details
Teres is based on classic tube amplifier topology.
Tube clarity and tone with might and power.
Unusual but true…
TRANSFORMER COUPLED HYBRID POWER AMPLIFIER
FEATURES
Audiophile long life input tube
Silicon carbide rectifiers
Shunt regulated power supply
Solar cell bias of output stage
Microprocessor controlled
operation
NO feedback
Special grade screened power transformer
JFET/MOSFET cascode output
devices
Available in stereo and mono version
Single-ended tube input stage loaded with a phase splitting transformer controlling 2 separate out of phase single-ended amplifiers for output.
The tube handles all the voltage gain needed. It uses a new generation or our choke rectified shunt regulated power supply providing a 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 through 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 insignificant amounts, leaving the “character” of the input stage untouched.
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 can 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 (120W/8Ohm and 170W/4Ohm Stereo).
Not sharing a common reference point apart from the load itself makes the second leg correct for any error produced by the first one. The result is an amplifier capable of extreme power while 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 power levels 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 galvanic 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 has the kind of understated elegance typical for Thrax. The exquisite aluminum finish adds to the presentation of a solid block of metal like a bigger brother of Heros. Enjoy.
Specifications
FAQs
Please read our FAQ before sending us a message.
How is my order processed ?
Once we have received your order and your payment, we issue you an invoice that will be mailed to you with a reference number for your order. Once your order is ready : it will be dispatched to you with insurance and tracking number.
Which payment methos are available in the Online Shop ?
You can choose between Paypal, bank transfer or Credit Card. Please take in consideration that payment via bank transfer will slightly delay the processing of your order as we have to receive your funds on our bank account to confirm your order.
Why are there different estimated delays prior to sending for some of the products
One of the politics of Ana Mighty Sound is that every order is unique and made for a single customer. You will find next to each item an estimated delay prior to delivery. We will do our best to fulfill it before this delay (and most of the time we do).
Please keep in mind that we are a 100% human company working all over the Old World (Europe) and that we do commit to deliver you the best made / best quality product available, and to insure that : this can take some time.
Of course… some of our products are in stock !
Can I specify a courrier for my order ?
Yes you can ! Just drop us a line in the « additional remarks » of your mail order. This may add additional fees to your order. We can work with DHL, TNT, FedEX, UPS, French La Poste or Chronopost.
What if I have received the wrong item ?
In the very unlikely case this would happen just send us a photo of what you received and we will send you a courrier to fetch the item back. Once we have checked it out, we will send you the correct item.
My items are not up to specifications, what should I do ?
This is highly improbable as we use the most modern techniques to insure that our products are up to specs. In fact we even have a dedicated person checking that every single item is in perfect condition prior to shipping. Of course it can happen, but we doubt it seriously. In any case if you were bothered by something : just send us an email and we will sort it out with you.
I am very happy/disappointed with my order and I want you to know it ?
Please do not hesitate to drop us a line and we will be always happy to answer all of your requests. Our aim is your complete satisfaction.