Ordering 2SK389 transistors for Pearl Phono. Please help, which brand/spec?

mattjk · 13th February 2005, 11:13 PM

http://www.partstore.com/PartNumberS...mber=%202SK389

Which one is the right part?! They have a bunch listed.

Thanks,
Matt

mattjk · 16th February 2005, 03:49 AM

bump

LineSource · 16th February 2005, 05:15 AM

JFET parameters have a very wide variation. Hand matching JFETs is very time consuming and expensive. If you know the approximate bias current in the circuit you can try to purchase binned parts. I typically bias my JFET diff amp stages to 4 ma per transistor and purchase the BL graded parts. A phono input stage that works on very low currents would likely use GL grade parts.

To my knowledge, these dual JFETs are now discontinued and there are mainly Toshiba old stock in the market.

2SK389, 2SJ109 Idss BINNING:
GL: 2.6-6.5ma
BL: 6-12ma
V: 10-20ma

You can also check component suppliers like MCM, Digikey, etc...to purchase these transistors. You might find better prices, but a higher minmum order requirement.

dzkh63 · 16th February 2005, 12:01 PM

I bought the 2SK389 from:www.ceitron.com,for my Pearl.
The price is:$2.25/each-buy 1-9 pieces
$1.75/each-buy 10 and up

uli · 16th February 2005, 12:17 PM

Quote:

Originally posted by LineSource

To my knowledge, these dual JFETs are now discontinued and there are mainly Toshiba old stock in the market.

Toshiba continues production but just on special order (huge quantities)

Uli

mattjk · 16th February 2005, 03:45 PM

Quote:

Originally posted by dzkh63
I bought the 2SK389 from:www.ceitron.com for my Pearl.
The price is:$2.25/each-buy 1-9 pieces
$1.75/each-buy 10 and up

Thank you!

I ordered 10 - 2SK389's and 16 - 2SK170BL's

Matt

13th February 2005, 11:13 PM	#1
mattjk diyAudio Member Join Date: Aug 2004 Location: Huntington Beach, Ca	Ordering 2SK389 transistors for Pearl Phono. Please help, which brand/spec? http://www.partstore.com/PartNumberS...mber=%202SK389 Which one is the right part?! They have a bunch listed. Thanks, Matt

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16th February 2005, 03:49 AM	#2
mattjk diyAudio Member Join Date: Aug 2004 Location: Huntington Beach, Ca	bump

16th February 2005, 05:15 AM	#3
LineSource diyAudio Member Join Date: Sep 2003 Location: SiliconValley	JFET parameters have a very wide variation. Hand matching JFETs is very time consuming and expensive. If you know the approximate bias current in the circuit you can try to purchase binned parts. I typically bias my JFET diff amp stages to 4 ma per transistor and purchase the BL graded parts. A phono input stage that works on very low currents would likely use GL grade parts. To my knowledge, these dual JFETs are now discontinued and there are mainly Toshiba old stock in the market. 2SK389, 2SJ109 Idss BINNING: GL: 2.6-6.5ma BL: 6-12ma V: 10-20ma You can also check component suppliers like MCM, Digikey, etc...to purchase these transistors. You might find better prices, but a higher minmum order requirement.

16th February 2005, 12:01 PM	#4
dzkh63 diyAudio Member Join Date: Feb 2004 Location: Hong Kong	I bought the 2SK389 from:www.ceitron.com,for my Pearl. The price is:$2.25/each-buy 1-9 pieces $1.75/each-buy 10 and up

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