First Watt Site Updates

[Nelson Pass]

I have just updated the FW website with new product announcements and
a new article about SITs.

www.firstwatt.com



(let me know what links don't work, and so on)

oh, and if you've been there before you might have to hit the refresh button on
some pages.

 

[buzzforb]

I hope to purchase one of your works of art at some point in my life. I really wish the time was now. Hope you plan to stay busy for a while. I hope you have great success with your new product.

 

[ungie]

Looks good!
The SIT amplifiers are interesting, but unfortunately won't work with my "conventional" loudspeakers. Of particular interest is the F5 Turbo. Can we expect something around 60-80wpc into 4 ohms?

 

[Nelson Pass]

I think you could exceed that pretty easily.

 

[Zen Mod]

01:28:28 Error: "Not Found" (404) at link www.firstwatt.com/pdf/art_zen_iv.pdf (from FIRST WATT ARTICLES)
01:28:28 Error: "Not Found" (404) at link www.firstwatt.com/pdf/art_arch_nemesis.pdf (from FIRST WATT ARTICLES)

 

[Zen Mod]

01:35:46 Error: "Not Found" (404) at link www.passlabs.com/images/banners/black_line.gif (from Pass Labs: Product Reviews & Awards)
01:36:14 Error: "Not Found" (404) at link www.passlabs.com/pdfs/product_lit/INT-lit.pdf (from Pass Labs: Download page)

 

[Michael Rothacher]

Thanks, I was seriously jonesing for a SIT update.

 

[mikojat]

I have just updated the FW website with new product announcements and
a new article about SITs.

FIRST WATT



(let me know what links don't work, and so on)

oh, and if you've been there before you might have to hit the refresh button on
some pages.

Thank you Mr.Pass...and I think it is 6moons product,there is first time I see... hehehehe...

 

[6L6]

Sooo..... How does the Pass SIT compare/differ from one of the off the shelf SemiSouth devices such as the R100?

 

[Zen Mod]

think ....... triodish comparing to pentodish

 

[anilva]

Thanks Papa. Looks like my next set of projects are decided...

 

[crt]

Already downloaded BA-3 Article (.pdf)
Thank's Papa

 

[cochleus]

The evolutionary path of the transistor has bifurcated; there is now a new species.

I like the meter on the front panel, nice touch.

Congratulation

 

[dcbingaman]

Hi, Nelson. Congratulations on the SIT-1 and -2. Wow - the damn things worked about as well as many of us predicted. The question is, how many devices do you have to make before a 100W single-ended or super-symmetry amp becomes a commercial reality ?

Can you do it with a multiple output device SiC JFet or will a single GaN Hfet-derivative device (HRL, Raytheon, et al.) be the ultimate answer ? Who knows, but we do know, today, that radar-derived Fets may be the key to the ultimate audio amplifier - Papa had the cajones to prove it.

 

[ra7]

F5 turbo and F6.... droooooooooool.....

 

[nar]

Site is very slow for me; must be the general interest

Best,

nAr

 

[Bksabath]

Yes Papa you do lok a bit tired

But Monalisa smile is still there..

Tanks for Crimbo or there about presents.

As ra7 said droooooooool.

 

[nar]

Yes Papa you do lok a bit tired

But Monalisa smile is still there..

Tanks for Crimbo or there about presents.

As ra7 said droooooooool.

Thinking about it, you look tired indeed, but still stunning ressemblance with Leonardo da Vinci

Best,


nAr

 

[generg]

so we have no more Mu follower but again CCS...?

 

[Johnloudb]

B4 Crossover

The B4 crossover sounds nice. I could really be interested in that for an active crossover for a 3-way speaker I finishing up. But I planned on a 3 way active crossover, unless I should do the tweeter/mid crossover passively.

Will the PCBs be available to purchase separately or is this going to be a stand alone unit only? I could definitely use the boards to make a 3 way crossover. I was planning on going the discrete JFET route and this would be perfect for me!

At long last, the B4 design is complete and the first production run of PC boards is off being fabricated. Delivery of first units is scheduled for January 2012.

The B4 is a two channel active crossover filter system. It has 6, 12, 18 or 24 dB rolloff slopes independently selectable for each of 2 high pass filters and two low pass filters. The frequencies of each of these filters is also independently adjustable over two ranges: 20 Hz to 1260 Hz in 20 Hz steps and 200 Hz to 12600 Hz in 200 Hz steps. Each of the frequency setting of the four available poles can also be adjusted independently of the other poles.

The circuitry consists entirely of discrete single-stage Class A DC coupled Jfet buffers operated without negative feedback, providing distortion below .001% at 1 volt and bandwidth from DC to 500 Khz.

The input impedance is 100 Kohms and the output impedance is 100 ohms. The high-pass filters are provided with variable attenuation at 0, -5, -10, -15, and -20 dB. The low-pass filters are provided with variable attenuation via front panel knobs.

Any unused portion (or all) of a filter circuit can be bypassed.