Jadis JA80 MKII

Jadis JA80 MKII

Manufacturer:
Jadis Electronics
Type:
Double push-pull monoblock power amplifier, Pure class A
Power:
Up to 90 Watt Rms per channel
Bias:
Automatic
Sensitivity:
500 mV
Tubes:
8xKT150/KT120/KT88/6CA7/EL34, 2xECC82, 2xECC83
Frequency Response:
20Hz to 27KHz
Number of blocks:
2
Consumption:
190 W each mono amplifier
Size:
26 x 62,5 x 24 per block
Weight:
35Kg per block

21 000,00€

About product

DESCRIPTION

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.

REFERENCES

"A pair of JA80MKII have one of the most holographic soundstages out there, with its outstanding depth and even great height. The JA80MKII has this ability to make sense of the musician's intent that separates the Jadis from much of the audio pack...." Alan Sircom - HIFI+

http://www.thresholdlovers.com/articles.php?lng=fr&pg=669

http://www.audioreview.com/cat/amplification/amplifiers/jadis/ja-80/prd_128589_1583crx.aspx

Jadis JA80's performance from the upper bass to the mid treble can be described as eminently musical. It has a real beauty of tonal rendering coupled with fine inner dynamics, achieved without any exaggeration of drive or presentation. The midrange was liquid, exceptionally relaxed, yet reproduced with first-rate transient and harmonic definition.

About brand

Jadis Electronics

Encouraged by this success, he decided in 1983 to rationalise his production and participate to the fundation of the JADIS Company. In the beginning, the amplifier was manufactured unit by unit, from the original plans, but quickly Mr Calmettes turned out his own technicians, who were able to produce electronics in accordance with his philosophy.

The quality of these amplifiers is, for the most part, provided by their output transformer. With an original conception and being as good as indestructible, it gives the amplifier absolute stability, whatever the load may be. Entirely made within the JADIS Company in Villedubert, it is wound by hand and then it is poured into a special resin, guaranteeing maximum soundproofing and thermal stability. As for the power, the specifications are amazing: the maximum acceptable power is 2500 W before saturation.

Being the only ones in the world which respect these specifications, the JADIS amplifiers give fantastic dynamics as much in the bass tones as in the higher trebles. They present a total lack of coloration, and most of them work in pure class-A.
For these reasons, it constitutes the ideal amplification system for all acoustic speakers, whatever the impedance curve, the type of functioning, or the efficiency may be.

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