FirstWatt SIT-2 Скачать руководство пользователя страница 14

thing that you notice when the amp is plugged in. The effect is a little intoxicating.   ...the SIT 
seems to bring a lot more control & detail to the speaker. The tube sweetness is present, yet  
the presentation is very clean. This is like a very nice low distortion SET.  The SIT presents 
details, but with proper dynamic contrast. Details do not poke you in the eye, they just 
naturally unfold as part of the music. 

Do simple SIT amplifiers sound the same as single-ended Triodes (SETs)?  That would be a 
matter of opinion.  Without an output transformer with its significant limitations, the SIT has a 
bandwidth and distortion edge.  On the other hand, some people like the sound of their 
transformers.

Me, I like to listen to the 

sound

 of different amplifiers.  I don't see a practical point in actually 

duplicating a SET amplifier.  The SIT gives me an opportunity to listen to the best that a single 
gain device can do.  Surrounded only by a few well-chosen passive parts, this transistor 
speaks with a single voice.  

Now the following is for your protection.

Do not defeat the AC line Earth ground connection on the amplifier power cord.  It provides an 
extra barrier to prevent potential shock hazard.  Do not replace the fuse with a type other than 
specified.

Do not operate the amplifier outside in the weather, or in and around water or anything 
resembling water.  If you spill a drink in the amplifier or if your dog/cat/child urinates on it, turn 
it off immediately, unplug it, and do not operate it until cleaned by a qualified technician.

If something gets loose or rattles around inside or smells funny, or if you can’t touch the heat 
sinks for 5 seconds or so, then turn it off, unplug it from the wall, and contact First Watt.

There are no user serviceable parts inside.  Do not open the amplifier, and if you do anyway, 
don’t operate it with the cover off.  There are hazardous voltages inside.  If you need to 
change the operating AC voltage, contact First Watt.  We are much happier helping you solve 
problems so that we can be certain that it’s done properly.  If you are far away and don’t want 
to ship the product for repair, we will assist your technician with information and parts.

Содержание SIT-2

Страница 1: ...First Watt SIT 2 Power Amplifier...

Страница 2: ...K setting which will work with anything Later you may wish to try driving the Gate terminal of the SIT device more directly by removing the gold jumper and inserting it in the 10K input position as sh...

Страница 3: ...ned that at one time they had made a special run of Static Induction Transistor devices on some kind of military industrial contract and that one of their technical people had remarked that they were...

Страница 4: ...etting of the SIT device to tweak it into the most preferred setting for different loudspeakers and listening taste It also helps compensate for small variations in AC line voltage The SIT 2 operates...

Страница 5: ...source components looks directly at the Gate of the SIT without other active components in between This is desirable but in this case the input impedance is 10 Kohms and plus the capacitance of the Ga...

Страница 6: ...nd a bandwidth to 500 Khz The choice of input impedance is made on the jumper of the XLR female connector associated with each channel on the back of the amplifier next to the input connector Just put...

Страница 7: ...ot of the distortion of the amplifier versus frequency shows a consistent character across the audio band This consistency of performance over the audio band is an important element to the sonic chara...

Страница 8: ...applications but after Sony and Yamaha ceased production versions suitable for audio power amplification have been highly prized and difficult to obtain Recently there has been renewed interest in SIT...

Страница 9: ...ordinary Jfet or Mosfet is very similar As with the Pentode the current flowing from Drain to Source in a Fet will flatten out as the voltage between those pins increases By contrast Here is a set of...

Страница 10: ...ut also the voltage across the device In this sense the gain device acts in a manner similar to a resistor whose resistance value is controlled by the grid voltage Similarly with the SIT device seen b...

Страница 11: ...Triode trick There are two things we want out of a solid state device for this purpose First we want a square law input characteristic like that of tubes Fortunately Fets do that already the current t...

Страница 12: ...l efforts by Sony and Yamaha were not minimalist they contained many parts in multiple gain stages and used a generous amount of feedback There are several reasons for the push toward minimalism The f...

Страница 13: ...at first off they can be made to sound exquisitely in many of the systems that would enjoy the performance of a SET amplifier These would be your high sensitivity loudspeakers featuring compression dr...

Страница 14: ...a single voice Now the following is for your protection Do not defeat the AC line Earth ground connection on the amplifier power cord It provides an extra barrier to prevent potential shock hazard Do...

Страница 15: ...AC 1 25 Amp for 240 VAC Weight 32 lbs Dimensions 17 W x 15 D x 5 H Colors Available in Black or Silver Warranty Parts and labor for 3 years not covering shipping costs or consequential damages Warrant...

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