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Old 13th February 2014, 08:32 PM   #1
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Default SIT Transistors for audio ?

For those who love SIT transistors and are ready to pay high prices for obsolete Sony parts, here is a manufacturer of SIT transistors:

Pulsed Power SiC SIT | Microsemi

Moreover, these are SiC transistors, therefore more powerful and faster than the silicon ones.

This one is a bit expensive at $2,457.5967:
0405SC-2200M | Microsemi
and you must buy 5 of them from Avnet for a total of
$12,287.9835

But one can build a beast of an amplifier with 5 of them in parallel.
One could build a similar amplifier to FirstWatt SIT-1 which would put several hundred watts as output !
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Old 13th February 2014, 08:45 PM   #2
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This one is much more reasonably priced:

IJW120R100T1 - Infineon Technologies

It's $65 at Avnet and one only needs to buy 2.
Moreover it's 1200V part, so it can also work nicely in a hybrid tube-transistor
amplifier.
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Old 13th February 2014, 09:08 PM   #3
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Hi Fireworks
Thanks for very interesting informations and links.

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Old 13th February 2014, 09:44 PM   #4
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Do You have buy them ?

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Old 14th February 2014, 12:03 AM   #5
Junm is online now Junm  Philippines
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Sony Vfets (SITs) are made for Hifi audio...but this things maybe not.
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Old 14th February 2014, 01:29 AM   #6
CBS240 is offline CBS240  United States
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Wonder if a cavity magnetron could be used as an audio amplifier..........highly doubt it.
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Old 14th February 2014, 05:52 PM   #7
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My mistake, the second one

IJW120R100T1 - Infineon Technologies

is not a SIT but a power JFet.
It might still be used for audio, for example in a single ended configuration.
It's a tiny bit more complicated to use in single transistor amplifier, one might need to use negative feed-back.

With a SIT one can build a single transistor, no feed-back amplifier like this one:

FIRST WATT S1

which is the purest form of audiophile amplifier !
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Old 15th February 2014, 02:51 AM   #8
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Just took a look .... Interesting device and as zm points out, the naming convention is curiously similar to the semisouth 120R100. A word of caution though - the Infineon part is adepletion mode device. So if you just sub it into a design intended for the semisouth you will get errr fireworks.....
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Old 19th May 2014, 07:17 AM   #9
Zero D is offline Zero D  United Kingdom
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Very interesting device indeed

Just to add,

https://en.wikipedia.org/wiki/Static...ion_transistor

The static induction transistor (SIT) invented by Watanabe and Nishizawa in 1950 http://handle.dtic.mil/100.2/ADA299605

List of, & PDF's of - "V-Fet/SIT (Power Junction Fet/Static Induction Transistor/normally-on Fet)" & "Power J-fet/SiC J-fet (Power Junction Fet/Silicon Carbide Junction Fet) / SiC Mosfet" AMPLIMOS one stage amplifiers amplificatori audio monostadio

https://en.wikipedia.org/wiki/Digital_do_MaiN

Digital Domain Product infomationbDC Amplifier B-1d

http://www.digital-do-main.com/pdf/S...o(English).pdf

Roadtour

6moons audio reviews: RoadTour Digital Do Main
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Old 19th May 2014, 08:48 AM   #10
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Hi Zero D
Thanks for pdf about SIT´s
I share this nice one to Pass Labs section

Kindly regards
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