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Jadis JA80 MKII Power Amplifier

Jadis



Jadis JA80 MKII

The JA80 is a power amplifier working in pure class A. It is the first amplifier created by the JADIS in 1983; it has been upgraded several times but remains the flagship of the brand.

It works in a "push-pull" configuration with triple load and autobias.
It can work with various types of penthodes: KT120, KT90, KT88, 6550, 6CA7 or EL34.

The MkII version brings the compatibility with the KT150 pentodes.

The function phase shifter is insured by a triode double ECC82 and the function driver by an ECC83.
The output transformer, guaranteed for life, allows an adaptation of impedance from 1 to 16 ohms.
The cathode circuit is protected by an individual fuse.
The power transformer is oversized for a better dissipation of heat and vibrations.
The filtering of the high voltages is assured by high capacity capacitors.
Heating the tubes is by alternate current with balance and noise reduction.
Output terminals allow a bi-wiring.
Gold connections assure a faithful broadcast of the signals.
The device is assembled with conventional cabling "point by point" and uses a silver / copper tin solder.
The frame, in 316L non-magnetic stainless steel, does not influence the electronics and renders the device unsensitive to external disturbances.

When switching from KT150 to another type of power tube such as : EL34, 6CA7, KT88, KT90, KT120 & 6550 a small modification has to be made inside the unit.

The tubes

For its electronics, JADIS uses tubes of different brands and various origins, which have specific features.
Tubes represent a key factor of quality; it is for this reason that every batch is strictly analysed in order to select only the best components.
At first, they undergo a primary selection to make them endure several firing cycles (dilatation of materials), allowing the detection of bad air vacuum and mechanical defects (Fixation of electrodes and airtightness of the glass/metal junction).
After that, they are measured one by one to inspect their characteristics and make their appairage (union of parts which are functioning in pairs).



The components

Our small-scale production method, added to many hours of listening, permit us to refine our selection, in order to reach to the optimal result.



The chassis

In extremely good quality surgical stainless steel, the chassis is at the same time aesthetic and hard-wearing, allowing us to guarantee the permanence of our products.

The gildings

 The ultimate touch of refinement, the twenty-four gold-plated brass, suiting each of our creations, is also a mark of the JADIS stamp.

The output transformer

Main parts of the creation, the transformers are hand-made on a digital winding machine, following the basic principles born from the passion and research of André Calmettes. Inestimable expertise, and the cornerstone of the high-quality of its products, JADIS keeps its trade secret very carefully.

The cabling

Stemmed from the world of high frequency electronics, the rules and techniques of manual cabling allow us to take full advantage of our equipment and contribute to the sound aesthetics of JADIS.

All Jadis products are made in France.

Type Pure class A monoblock power amplifier
Bias Automatic
Power Up to 90 Watt Rms per channel
Bandwidth 20Hz to 27KHz
Sensibility 500 mV
Tubes list 8xKT150/KT120/KT88/6CA7/EL34, 2xECC82, 2xECC83
Dimensions 260 x 625 x 240 mm per block
Weight 35 Kg per block
Consumption 190 W each mono amplifier

 

"The JA80 MkII really brought out the passion in playing."

- Read the review from Absolute Sound for Jadis JA80MKIIhere.

"The JA80 MkII's captivating performance can only be described an eminently musical. It has a beautiful tonal rendering coupled with fine inner dynamics."

- Read the review from Blue Bird Music for Jadis JA80 MKII here.


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