SIT - static induction transistor

Cevni, tranzistorski, hibridni...
softspeaker
Site Admin
Posts: 2115
Joined: 11 Mar 2009, 09:45
Location: Brezno (Abyss)

SIT - static induction transistor

Postby softspeaker » 30 Nov 2011, 12:36

via 6moons:

http://www.firstwatt.com/pdf/art_sit_intro.pdf

Nelson Pass' FirstWatt SIT 1 is nearing completion. This 10-watt mono amp is a single-stage zero-feedback zero-degeneration single transistor affair built around a custom power JFET called a static induction transistor or SIT. The original ideas to such parts date back to Yamaha's and Sony's vertical JFETs of the 1970s. Nelson's custom SemiSouth part exploits modern silicon carbide construction. Exhibiting real triode curves, the SET connection intensifies by way of adjustable class A bias to "tweak the transistor's load line to best match the loudspeaker".

Ma kdo kašne izkušnje z njimi?

Image

softspeaker
Site Admin
Posts: 2115
Joined: 11 Mar 2009, 09:45
Location: Brezno (Abyss)

Re: SIT - static induction transistor

Postby softspeaker » 30 Nov 2011, 17:02

Digital Do Main B-1a

še eden baziran na SIT:

http://www.hi-fiworld.co.uk/index.php/a ... ?showall=1

http://www.techradar.com/reviews/audio- ... ?artc_pg=1

http://www.6moons.com/audioreviews/road ... visit.html

Image

http://www.hi-fiworld.co.uk/images/stor ... ircuit.gif

The B-1a basic circuit topology, with phase splitting and gain from two differential pairs,
and one pair of N Channel 2SK77 output devices. The amplifier is all direct coupled.
Not shown here are protection circuits, servo circuits, power supply and suchlike.

softspeaker
Site Admin
Posts: 2115
Joined: 11 Mar 2009, 09:45
Location: Brezno (Abyss)

Re: SIT - static induction transistor

Postby softspeaker » 30 Nov 2011, 17:17

Technical Brain

še zadnji komercialni SIT:

http://www.technicalbrain.co.jp/en/

Image

http://www.avhub.com.au/images/stories/ ... _lores.pdf

http://www.avguide.com/blog/high-end-au ... ical-brain

Ampak - kaj je narobe:

http://audiofederation.com/blog/archives/718

The smaller TAD speaker’s sound was filling the room quite well without overloading it. Lloyd was playing an LP with the famous track from the Burmester CD about the diamond mine trains in Africa. OK. We’ve all heard this track like a million times, right? The singer’s voice is a combination of showman, stylized story telling and real [spooky] anguish sometimes slips through.

Well, not with this system. There was hardly any micro-dynamics or inner-detail - hardly any note attack and decay at all. There was NO emotion to the voice. You could understand the words, but not much was accessible beyond that.

But there was like NONE in this system.

[I am ignoring the rack and amp stand.. even the most terrible micro-dynamic-absorbing but quite popular racks and amps stands could not do THIS much damage to the micro-dynamics… and they would do it in an uneven fashion across the freq spectrum, causing tonal anomalies but leaving micro-dynamics alone at various frequencies for us to hear, for the most part]

So we are down to the Technical Brain TBC Zero Pre-Amplifier and a Technical Brain amp… and the TAD speakers. One of these two brands is INcapable of rendering micro-dynamics, and I would say, incapable of rendering any fine detail at all.

Which one is it?

Don’t know for sure, but let’s look at both for a second. We heard Technical Brain electronics at CES in the big Magico room. This is inconclusive because that system had a lot of problems - and close listening [beyond gross evaluations] did not seem to be of interest given the limited time available at these shows.

We’ve heard TAD speakers at these shows many, many times. But I’ve just realized in the last few days that I’ve never heard them on anything but muscle amps - designed to produce loud impressive noises. Never with an amp designed to reproduce music in its entirety [see list below for possible candidates if we must stick with solid-state i.e. because the speakers need a lot of power].

Drugi pa spet:

http://www.avguide.com/review/technical ... mp-tas-213

Over the last few years I’ve reviewed some truly great solid-state amplifiers and preamplifiers from MBL, BAlabo, and Soulution and heard a goodly number of other top contenders from Spectral, Boulder, Krell, Burmester, Pass Labs, DartZeel, and (at this past CES) newbies Constellation and D’Agostino. Come now the TBP-Zero EX 350W monoblock power amplifier and TBC-Zero EX linestage preamplifier from award-winning Japanese designer Naoto Kurosawa, and, while I can’t (and don’t) say that these Technical Brain components leave their distinguished solid-state competition in the dust, they have certainly set new standards of transparency, neutrality, and resolution chez Valin. Indeed, when they’re driving the ultra-transparent, ultra-high-resolution Magico Q5 loudspeakers, I have yet to hear electronics that are more faithful to sources or more lifelike when those sources are top-notch.


softspeaker
Site Admin
Posts: 2115
Joined: 11 Mar 2009, 09:45
Location: Brezno (Abyss)

Re: SIT - static induction transistor

Postby softspeaker » 03 Dec 2011, 12:49

Treasure SIT becomes a power amp

A zna kdo Japanese? Tole pravi gugl translejt:

"SIT pridržuje roke v 20. stoletju to sanje ali vizije, ali, še bolje, kot sem diamant nakit.
Sanjal sem o tem, kdaj bi se amp na dolgi spanec.
Izdelajte sijaj najboljše amp polish kroga pomnoži s SIT."


http://www.ne.jp/asahi/evo/amp/TreasureSIT/report.htm

Image

Image

softspeaker
Site Admin
Posts: 2115
Joined: 11 Mar 2009, 09:45
Location: Brezno (Abyss)

Re: SIT - static induction transistor

Postby softspeaker » 03 Dec 2011, 12:53

SIT fiesta!

Maxonic SIT OPT Power Amplifier SD-011, SIT OTL Power Amplifier SD-013, SIT Line Controller SLC-021

Features:
1) Odd numbered harmonic distortion is almost zero due to SIT characteristics being equivalent to triode tube with low output impedance.
2) Least phase fluctuation because of excellent linearity in voltage amplification and full voltage drive.
3) Progressive signal-to-noise (S/N) ratio in SIT circuit boasting superior high frequency response and low level of noise generated inside semiconductors.
4) Large amount of thermal capacity proves thermal stability and less infection by temperature change.
5) Excess force in electric power can deliver significant power output, keep elemental device's resonant point low, and supports fine linearity of the output power.

http://www.sibatech.co.jp/maxonic/amp.html

Image

softspeaker
Site Admin
Posts: 2115
Joined: 11 Mar 2009, 09:45
Location: Brezno (Abyss)

Re: SIT - static induction transistor

Postby softspeaker » 18 Mar 2012, 19:57

Še SIT tranzistorji, Progressive Audio A1 (30W):

Mit dem neuen A1 will Progressive Audio den teureren Vorgänger A2 toppen – den besten Transistor-Amp, den stereoplay kennt.


http://www.progressiveaudio.de/

http://www.stereoplay.de/testbericht/pr ... 16858.html

http://www.progressiveaudio.de/DOWNLOAD ... eoplay.pdf

http://www.progressiveaudio.de/DOWNLOAD ... udioA1.pdf

http://www.progressiveaudio.de/DOWNLOAD ... STEREO.pdf

Image


Return to “Ojačevalci”

Who is online

Users browsing this forum: No registered users and 3 guests

cron