2sk170bl Where??

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#2
Hello,
What is the difference between 2SK170BL, 2SK170GR and 2SK170V? You can find them here: http://www.borbelyaudio.com/pics/Compprice.pdf Not very cheap. I live in Sweden, they are sometimes slightly cheaper here and can be found at various places. At Elfa, the largest supplier here, 100 pieces of 2SK170GR (Toshiba) are about 41 € + shipping. I will be needing some myself. Can buy some extra and send them to you if you are interested.

Roger
 
#3
The suffix GR, BL and V are the different Idss of the jfet, and is very important for the different use that you made.
If use in signal preamplifier of small signal o driver, o out of small amplifier ( type OA with discrete device).
I know Borbely, but I think that Elfa is good price and I try to buy from there.
Other important question is that is in Europe and isn’t import tax.
Regards

Gp

p.s. if need you ask.
 
#4
🙂
i dont know exactly about prices
but
1- 25- 100-
prices in € euro, is no rip off, as i can understand
for
2SK170GR7/Toshiba original
0.717 € - 0.521 € - 0.405 €
Click to expand...

I will order some 2SK170GR myself
They are very useful for audio! .. have a look at www.passdiy.com
..
as well as I will at same time
also order the good alternative Low Noise JFET
2SK117, 50 volt max - unfortunately i do not know the max current of that one ...
this also have different suffixes
but is not told at
http://www.elfa.se/en/
website


Regards from near to you ( north of polar circle! AC-län )
lineup
http://lineup.awardspace.com/
 
#6
If you send me the schema I control it and indicate the correct type, I think the GR type.
See this photo by Pass for section and pair the jfet.
Regards
gp
 

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#7
g.pietro!

You can find the schematic here: http://user.faktiskt.se/RogerGustavsson/telinga.pdf

It is not tested. A friend is trying to analize the circuit. Input is about 8 mV at maximum. Maybe the gain is to high. A total gain of 50-100 with the SSM2142 (which has a gain of 2), would suit fine.

As the 2SK170GR are the only ones to be found, maybe there is no choice at all.



Arrividerci!

Roger

(have not been to Italy for some time now and I have lost almost all my knowledge of the italian language...)
 
#11
http://user.faktiskt.se/RogerGustavsson/telinga.pdf

Excuse me for delay but the time is always few. I open the MC pre telinga and by examine it is :

From left to right, only the first jfet amplifier, the up id load active ( current generator ), the third is a buffer and adapter the load but no amplifier ( is gain is 1).
Now all is only two stage active in cascade, I think ( if SSM2142 gain 2) all gain 20/30 , if necessity of more gain is necessary change circuit o plus one stage active.
The type of 2SK170 correct is GR small current of Idss.
I hope useful for you.
Regards
g.pietro
:smash:
 
#18
I think that the simulation is correct, I say that the total gain , is only two stage, is 10/15
The first is a common source and usually gain 10/15, the second is e operational amplifier and, I don’t know the connection, you say that gain 2 ; the total is the product.
Now I know the http://www.schuro.de I write four time in English, for order about 100 euro of device…………….. nothing answer; I write three time in German ( a friend help me because I don’t know the language) , and I wait two week the answer…………. Nothing.
Eureka I buy some device to ELFA , and wait the package, but is necessary no order more 50 euro o expedition in expensive ( 45 €).
Expedition with post, minus 50 euro, cost only 12 euro…… acceptable.
Regards.

Giampietro
 
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