Thrax Libra 300B
Pairs well with
Thrax Libra 300B
Product details
Statement differential balanced 300B tube preamplifier of the 21st century
Statement differential balanced 300B tube preamplifier of the 21st century
FEATURES
Post amplification volume control for lowest noise
Modular construction
External dual mono power supp-ly with choke input rectifier for lowest switching noise
Programmable Balanced Tape loop
Stepped volume control for perfect repeatability of level settings
Interlocking solid aluminum chassis
RCA and XLR inputs with adjustable sensitivity controls
Highest quality long life 300B tubes
Single gain stage
Dual balanced output for bi-amping with offset adjustment
Home Theatre bypass feature for integration in Home Cinema systems
Microprocessor-controlled opera-tion for safety
Special filament heating circuit for harmonic richness and tube protection
Current sourced regulator for stable power-allowing explosive dynamics and tonal purity
DC-coupled input and output for ultimate transparency
Balanced differential topology for noise immunity & subtle dynamics
Auto-bias for compensation of tube aging and correct operation of any 300B
Libra employs two 300B tubes per channel in true dual mono differential pure class A triode operation to form a gain stage so unique that presents a tonal spectrum that is dense and clear revealing extra layers of unexpected information in the recordings. Libra paired with the Thrax Spartacus 300 allows users for the first time to experience a full 300b signal amplification path and be stunned by it.
Libra features two independent outputs that can be offset from each other to allow for bi-amplification with different amplifiers for mid/hi and bass. For example a single-ended triode amplifier for mid/hi and a powerful push-pull amplifier for the Low frequencies. The offset lets you adjust for the different gain of the amplifiers and keeps their volume levels in sync.
Another unique feature of Libra is the fully balanced Tape Loop allowing the use of professional tape recorders like Studer, Ampex and many others so you can take full advantage of the quality of your master tapes.
A home cinema bypass is also available for those wishing to integrate the stereo system in a media room. A “trigger out” function is provided for turning amplifiers in hard-to-reach places on or off automatically when powering on your preamp.
Our goal was to create a pre-amplifier worthy of driving the Spartacus 300 power amplifiers known for their ability to preserve the signal’s tone and texture at all levels, not constraining the dynamic expression or imposing any coloration to it. Libra had to be at the uncompromising level of the 300b input stage of Spartacus 300 or better in order not to affect its sound. But we already use one of the most linear tubes there, so the choice was an inductively loaded heavy class-A differential stage canceling out the Libra’s 300b’s negligible 2nd harmonic leaving the spectrum absolutely clean.
DHT tubes require a lot of auxiliary electronics for optimal operation, so in this case we have split the unit in two parts. A power supply and the active unit. This keeps all mains AC and rectifier noise in a separate box while final regulation and filtering is still done next to each element in the amplification circuit. Everything is microprocessor controlled and the unit’s status is displayed on a large color LCD visible from your seat.
Libra should not be talked about but listened to
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.