08 Oct 2012 à 17:31
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08 Oct 2012 à 20:18
Coles a écrit:Ma Cunningham a des petits débris qui se baladent à l'intérieur, pourtant elle marche, c'est grave Dottore ?
08 Oct 2012 à 20:19
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09 Oct 2012 à 18:03
11 Oct 2012 à 13:30
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12 Oct 2012 à 10:42
12 Oct 2012 à 10:51
12 Oct 2012 à 17:29
Jodemontmartre » 12 Oct 2012, 10:42 a écrit:Le bon vieux Dionyssos à la rescousse:
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"Balance, smooth, solid, elegant,accurate, with a slight aroma" ( Équilibre, Douceur, Élégance, Juste, avec un arôme subtil )
Espérons qu'il n'y a pas le son du tonneau, aussi.
http://dionysusspeaker.com/product.html
12 Oct 2012 à 18:00
12 Oct 2012 à 18:25
12 Oct 2012 à 19:58
TWEAK nr.2 features following:
1-Electronic DC voltage Regulation of the 45 tube filament voltage. We do so with a module that we build here in Germany specially for the A08-S. The advantage of using a module is, we need practically not change the original wiring. All we do is, increase the transformer AC voltage, and then cut just one connection of the filament voltage to the tubes, and add in the module here. So the original wiring is almost unchanged. The module has temperature protection, and is short circuit proof, for in case a tube has a short circuited filament. This deals with the nasty variation of the mains voltage, which makes that tubes can be off-bias. Mains variations of more than 5% are nothing unusual, and mains voltage "quality" goes down every year. We have to get used to larger ups and downs. If tubes bias too high or too low, in each case hum can result, and also tube damage can occur.
2-Virtually no AC hum from the filaments. Reason is, we feed the modules with the passive stabilized voltage that is originally in the amplifier, since we leave that circuit in, and use it now for this purpose. The modules reduces that hum fraction another 100dB. (which is really very much).
3-Adding of a pair of LUNDAHL 1531 isolation transformers. With the incredible bass efficiency, smallest ground loops will cause traces of hum, and you'll never find where it comes from, and if you do, you can only cure it like we do here anyway. So this has nothing to do with good or bad amplifiers or speakers, it is your cables, but since cables are unavoidable, these professional transformers is what you need. The standard Yamamoto input connectors are already prepared for this. As a user need to do nothing special, you just plug on the RCA plugs as normal. But now, inside the apmplifier the hum that comes in, can not pass the audio isolation transformers.
4-We do some changes to the High Voltage stabilization to make the above possible.
5-The modules have a current limited startup mode, providing a slow start. It is also short circuit protected and temperature protected. The slow start must be no longer than needed though. After the tubes light up, the modules go to the voltage stabilization mode. This is ideal for a DHT tube, and keep it in good condition.
12 Oct 2012 à 20:28
12 Oct 2012 à 21:01
12 Oct 2012 à 21:05
13 Oct 2012 à 10:17
13 Oct 2012 à 11:30
Cedric.H » 12 Oct 2012, 21:01 a écrit:Merci Xavier pour ces informations et ce topo très complet.
Je dois réceptionner cet appareil d'ici peu.
J'irai voir d'abord du côté du redresseur et puis après on verra bien ce qu'il en est du reste.
L'expérience me prouve que l'on peut avoir le silence de fonctionnement "intégral" sur un ampli à triode ... et les tubes Emission Labs sont parfaitement au point sur ce critère.
C'est très important à mes yeux.(surtout lorsque j'écoute du clavecin tard le soir et à faible volume)
++ Cédric
13 Oct 2012 à 16:46
Coles a écrit:De rien, tiens-nous au courant des résultats, ça m'intéresse aussi.