2sk330 Nf

[GIPIONE]

I am try to found the NF of this fet, but the data sheets of Toshiba ( 2003-03-25) don’t write this important value.
Same of you know it?
Thank
Giampietro

[widowmaker]

Hm, Toshiba has on their 2SK330 these symbols:
Id @ Ugs=0V : Y: 1.2~3.0 mA, GR: 2.6~6.5 mA, BL: 6~14 mA
Try with another manufacturer...but I think that only Toshiba is a manifacturer of 2SK330
( probably )
or... your JFETs are fake...

[lineup]

Originally posted by GIPIONE
I am try to found the NF of this fet, but the data sheets of Toshiba ( 2003-03-25) don’t write this important value.
Same of you know it?
Thank
Giampietro

I do not know if there are different datasheets PDF
and if NF is in any of them

Here is a search 2SK330 at datasheetarchive.com

http://www.datasheetarchive.com/sear...330&sType=part

[GIPIONE]

o.k. thank for the link of data sheets, but I don’t find the noise figure ( NF) of this device.
The NF is very important value if you use this component in audio application , that I want do tha KANEDA line and phono, I don’t find the 2SK33AGR for the input differential stage, and for the Yfss and Ciss I think substitute with the 330 but I don’t know the NF and Is possible a phono with to much noise.

Thank

g.pietro

[widowmaker]

2SK170 is preferable...
NF is 0.5dB (typical)
2SK389, when the input stage is differential...NF is the same.

[claudio]

2SK389, when the input stage is differential.

Hi,
is possible to use the 2SK389 in a not differential schematic? I mean, the first transistor for the left channel, the second one for the right channel, being the 389 a double transitor?

Regards,
Claudio

[tvi]

Which Kaneda line & phono are you considering?
I don't recall Mr Kaneda using a 2SK33AGR, maybe your schematic is a bit indistinct and should read 2SK30AGR.

Have a look throught this site (sorry it in Japanese) konton the second button (red) is Kaneda preamps.

Hope this helps

Regards
James

[widowmaker]

Originally posted by claudio


Hi,
is possible to use the 2SK389 in a not differential schematic? I mean, the first transistor for the left channel, the second one for the right channel, being the 389 a double transitor?

Regards,
Claudio

The substrate is common for both transistors.
In your cause it is possible, both JFETs work @ the same voltage.
Just connect the substrate lead (pin 4) @ most negative supply.
But you can't use separate PS for each channel.

[GIPIONE]

Sorry is error Kaneda use in differential input stage the 2SK30AGR no 2SK33AGR
Pardon.

gp

[GIPIONE]

Ok I know the sound and quality of 2SK170 are very sonic, but is necessary pay attention to Yfs are no same


170=22
330=4
30= 1,2

is value typical and is no very important if you use this device in circuit with all feedback ( kaneda for example) where the all gain is determinate by the feed and no by single component.

G.ietro