{"id":3251,"date":"2025-04-17T14:55:12","date_gmt":"2025-04-17T12:55:12","guid":{"rendered":"https:\/\/vumetre.com\/en\/?p=3251"},"modified":"2025-04-22T17:12:52","modified_gmt":"2025-04-22T15:12:52","slug":"jadis-i70","status":"publish","type":"post","link":"https:\/\/vumetre.com\/en\/tests\/types\/amplifier\/jadis-i70\/","title":{"rendered":"JADIS I70"},"content":{"rendered":"\n

By the manufacturer’s own admission, whose catalogue is not short of models, the idea of developing a new built-in had been brewing for some time. A modern integrated with a new look and enhanced performance. The growing power of the new KT170 tetrode did the rest! So welcome to the new Jadis I70, a handsome, squared-off instrument that’s as faithful as ever to the philosophy of the proud Languedoc manufacturer.

<\/strong>When you first look at the Jadis I70, you get the feeling that the design has become more modern. However, the manufacturer has lost none of its visual signature, which makes a Jadis an electronic watch like no other. The I70 is no exception to the rule of the stainless steel case and 24-carat gold plating, the famous Jadis Touch that combines classicism and elegance. The chassis is low-slung, lightening the overall appearance. The mirror-symmetrical layout of the tubes and transformers and the square footprint contribute to the visual rejuvenation of the Jadis I70. The rear layout of the exclusively analogue and unbalanced connectors, in particular the left and right speaker outputs, was dictated by the internal layout of the circuits wired in the air, which the manufacturer has revised and improved.<\/p>\n\n\n\n

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The power supply and output transformers, all barrel-mounted and resin-damped, have been the subject of new research to meet the needs of the Jadis I70, which incorporates several technical features found on Jadis monoblocks. As usual, they are designed and built in situ at Villedubert. The output transformers have been adapted for use in a simple ultra-linear push-pull configuration with the new Tung-Sol KT 170 power tetrodes, with a huge operating margin to guarantee an extremely low distortion rate throughout the available power range, announced at 60 W in pure class A.

Incidentally, Jadis is one of the very few manufacturers in the world to offer push-pull assemblies operating in pure class A rather than class AB. This implies an operating point with a higher quiescent current than in class AB (current virtually zero or very low in class AB) and consequently push-pull output transformers capable of withstanding this quiescent current while retaining the primary inductance necessary to ensure a satisfactory response in the low frequencies.
As for the power supply transformer, it has been designed with multiple secondary windings to match the new circuit structure, which separates the power supply for the power block from that of the input and driver stages in order to avoid any intermodulation, particularly during current-hungry transient modulation peaks.

The high voltage is regulated by a transistor circuit whose heatsink can be seen on the chassis. Filament heating is regulated and stabilised to eliminate any risk of induced noise.

The Jadis audio layout is based around nine tubes: two ECC83 high-gain double-triodes, three ECC82 medium-gain double-triodes and four KT170 beam tetrodes with a glass envelope in the shape of a Coca-Cola bottle. The internal void volume is higher than that of a KT150 to improve heat dissipation.

The gain and driver stages are in a classic configuration, similar to the manufacturer’s other push-pull schemes.<\/p>\n\n\n\n

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The set up<\/strong><\/p>\n\n\n\n

The Jadis I70 has a square footprint measuring 40 cm on each side. What’s more, at 30 kg, it’s a heavy product, with its centre of gravity pushed backwards. It is therefore essential to provide it with a particularly sturdy stand, and to be very careful in the case of a tripod with a single rear stand. On the other hand, when it comes to loudspeakers, this amp is relatively versatile. We’ve paired it with a number of quite different models, and each time, the marriage has been completely conclusive.<\/p>\n\n\n\n

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The sound<\/strong><\/p>\n\n\n\n

Rarely has a brand of amplifiers offered such a charismatic sonic personality as Jadis. And yet, the brand has demonstrated its ability to evolve over time to remain as relevant as ever. The proof is in this new integrated amplifier with majestic KT170 tubes, a rejuvenated look and reproduction that’s as addictive as ever. It doesn’t take long to be convinced that this is one of the Languedoc manufacturer’s marvellous products. That said, even if the essential virtues of Jadis are still there, you can quickly detect a real modernity in the way they are highlighted. The manufacturer’s strong point is its ability to magnify sound. Jadis always sounds majestic, rich and full: it’s a party every day. There’s never a dull moment, time flies, and recorded music is always wonderfully embodied. The term \u2018sonic density\u2019 seems to have been invented for the manufacturer. With the Jadis I70, this formidable presence is there. On the other hand, we quickly notice an unprecedented tension, a way of sharply emphasising rhythmic tracking, of demonstrating a more marked reactivity than usual. This I70 is very lively, lighter too, but no less robust. It retains everything that has forged the Jadis reputation, while adding a substantial dose of precision and \u2018piquancy\u2019. As a result, the soundstage is as majestic, wide and deep as ever, but it is now much more precise, with better-defined placement of instruments in space. The punctuality of the various sound sources seems to be better achieved. We felt this very clearly, whether on the B\u00f8rresen Z-2s or on our T&T Nel Extr\u00eame. In both cases, but with nuances that the I70 highlighted perfectly, the sound environment is set up in an extremely exhaustive way and with a very nice gradation of the different planes according to the three axes (width, depth and height). This hyper-successful spatialisation combined with a spectral balance of great beauty delivers a level of sonic pleasure that is as vivid and persistent as ever. And the Jadis I70’s ability to handle the explosiveness of a big band or symphony orchestra is particularly exciting. The I70 is very much at home in exalting the articulation of the most diverse styles. On the contrary, it never imposes the slightest restrictive vision.<\/p>\n\n\n\n

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Our conclusion<\/strong><\/p>\n\n\n\n

As always, a Jadis amplifier is particularly hard to resist. It has a strong personality. That said, contrary to certain preconceived ideas, this in no way prevents you from enjoying your favourite music with a sense of discovery. Because the Jadis I70 is in no way a device that simplifies or modifies the message. On the contrary, it tends to sublimate it, giving it the opportunity to surprise you in an emotional and sensational way. What’s more, this new vintage, adorned with the KT170s, is capable of powering top-of-the-range loudspeakers with obvious ease, persuasively and with that unique verve. At the end of each listening session in its company, you can’t help but think that, in the end, nothing else matters… A great vintage from the South!<\/p>\n\n\n\n

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Author<\/strong>: Pierre Fontaine<\/p>\n\n\n\n

Technical sheet: JADIS I70<\/strong><\/p>\n\n\n\n

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  • Origin<\/strong>: France<\/li>\n\n\n\n
  • Price<\/strong>: \u20ac11,500<\/li>\n\n\n\n
  • Dimensions<\/strong>: 400 x 400 x 255 mm<\/li>\n\n\n\n
  • Weight<\/strong>: 30 kg<\/li>\n\n\n\n
  • Power<\/strong>: 60 W per channel in pure class A<\/li>\n\n\n\n
  • Bandwidth<\/strong>: 10 Hz to 36 kHz<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

    By the manufacturer’s own admission, whose catalogue is not short of models, the idea of developing a new built-in had been brewing for some time. A modern integrated with a new look and enhanced performance. The growing power of the new KT170 tetrode did the rest! So welcome to the new Jadis I70, a handsome, […]<\/p>\n","protected":false},"author":3,"featured_media":3423,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[25,67,35],"tags":[],"class_list":["post-3251","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amplifier","category-jadis","category-tests"],"_links":{"self":[{"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/posts\/3251","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/comments?post=3251"}],"version-history":[{"count":0,"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/posts\/3251\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/media\/3423"}],"wp:attachment":[{"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/media?parent=3251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/categories?post=3251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vumetre.com\/en\/wp-json\/wp\/v2\/tags?post=3251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}