2SK170BL
wouldnt this be found?
If you do buy single transistors, for example 2SK170, you should buy at least 10 pieces (or more)
so you can find a matching pair.
2SK170 is one of the JFETs Nelson Pass uses in his examples
on how to build your own OP-amp
http://www.passdiy.com/pdf/diyopamp.pdf
Shoog said:
The BD911/912 are fairly standard, I think, but nothing special. I assume you mean hfe, not hte, but why would that be a problem? These transistors have a min hfe of 15 only, not very hard to beat.
Your right about the hte been hfe, my mistake.
It says on the schematic that the BD911 has a hfe of min 120 and the BD912 a min of 160. Is this correct ??
The 2SK170 isn't in my Farnell cat. Infact FETs in general are very scarce in the farnell cat.
Shoog
It says on the schematic that the BD911 has a hfe of min 120 and the BD912 a min of 160. Is this correct ??
The 2SK170 isn't in my Farnell cat. Infact FETs in general are very scarce in the farnell cat.
Shoog
Shoog said:
At least it is very wrong for those ones manufactured by ST. However, i was lazy and took my figure from the suppliers catalogue. Doublechecking with the datasheet, I find that 15 was the min hfe @ 5A, which may seem lowish if compared to figures measured at lower Ic. The hfe figures are
40 - 250 @ 0.5 A
15 - 150 @ 5 A
5 - ? @ 10 A
The Toshiba 2SA1943/2SC5200 easily beats the min figures, and can be bought in selected hfe classes with guaranteed high min hfe.
BD 911/912 are robust, very cheap transistors... They are not so fast, but they are very reliable - at last years, I was using cca 1000 pieces of both polarity with 100 % reliability ( never change them ) 😉
May I? ... I'll bring Fonseca Bin No. 27 
widowmaker said:
Yes, if they can be found it is best alternative. For sure!
But it is my experience they are not as easy to find everywhere
as is 2SK170 or 2SK117.
Maybe time to try a 'Trading Post'.
If those with 2SK389 wants to sell such good stuff ....
😎
lineup said:
I have some 20 of those, as well as the 109, but I'm not selling or trading, because I have been using them and I have some other projects on the way.
If I can get them in my country, why can't you get then in England?
😕
Try here
www.mcminone.com has the Toshiba 2SK389BL in stock for 3.09 in singles and 3.00 USD in quanities over 10. This is a Farnell company, so they should be available over there.
Farnell sells direct to the US also, they should be able to source both directions. I have purchased a bunch of Rubycon ZA and ZL from Newark that shipped from Farnell. Deltron locking DIN connectors and enclosures also are sourced from Farnell and sold in the US.
George
www.mcminone.com has the Toshiba 2SK389BL in stock for 3.09 in singles and 3.00 USD in quanities over 10. This is a Farnell company, so they should be available over there.
Farnell sells direct to the US also, they should be able to source both directions. I have purchased a bunch of Rubycon ZA and ZL from Newark that shipped from Farnell. Deltron locking DIN connectors and enclosures also are sourced from Farnell and sold in the US.
George
Shoog said:
carlosfm said:
Yes, you are right. If I decide to build this amp I can get 2SK389.
Right now I do not plan to. Even if it is a most interesting design and project.
My post was comment to Shoog. He hadnt found 2SK170 in Farnell.
Dalbani, for example, sells 2SK389
http://www.dalbani.co.uk/electronic_components/transistors.php?offset=5720
Cricklewood Electronics have good range of FET's
http://www.cricklewoodelectronics.com/Cricklewood/customer/home.php
http://www.cricklewoodelectronics.com/Cricklewood/customer/home.php
OK, now I make web page (in english) @ www.class-audio.com
I hope, that I finished it @ the end of the week...
I hope, that I finished it @ the end of the week...
widowmaker said:
Good luck with your webpages, widowmaker.
But no big hurry.
Because most of us have this plan:
- we will live for a couple of more years from now.
😉
lineup said:
Guys,
Please take a look at the next URL. I bought there 6 x 2SJ109BL and 6 x 2SK389BL.
These JFET's arrived two weeks ago, everything looked very fine to me.
Price: 2SK389BL = €1.75 2SJ109BL = €6.9
http://www.donberg.ie/
Greetz
Ben
The original DoGC uses a power supply of +-30 VDC
These are orginal transistors:
2SK301 N-FET / 55V / 10mA
BC560C TO92 45V
BC550C TO92 45V
IRF9610 TO220 P-FET / 200V
IRF620 TO220 N-FET
BD911 TO220 NPN / 100V / 15A / 90W
BD912 TO220 PNP / 100V / 15A / 90W
-----------------------------------------------------------------
Replacement of 2SK301 should be at least 40V and >=10mA JFET
Both these should possible
2SK170 N-FET / 40V / 20mA
2SK389 2*N-FET / 50V / 20mA
If using 2SK389, dual, it does not fit a PCB made for single JFETs
unless this option is at card.
For IRF9610/IRF620 I think there are several options.
Maybe even IRF9510/IRF510 which are 100V
I dont think it makes too much difference using
IRF510,520,530,610,620,630 and the IRF9xxx of the same.
There might be some TIPxx that can replace BD911/912 100V TO220
Should be at least 80V transistors, I think.
This is some of my thinkings
But I am not sure of this.
widowmaker and others will tell.
These are orginal transistors:
2SK301 N-FET / 55V / 10mA
BC560C TO92 45V
BC550C TO92 45V
IRF9610 TO220 P-FET / 200V
IRF620 TO220 N-FET
BD911 TO220 NPN / 100V / 15A / 90W
BD912 TO220 PNP / 100V / 15A / 90W
-----------------------------------------------------------------
Replacement of 2SK301 should be at least 40V and >=10mA JFET
Both these should possible
2SK170 N-FET / 40V / 20mA
2SK389 2*N-FET / 50V / 20mA
If using 2SK389, dual, it does not fit a PCB made for single JFETs
unless this option is at card.
For IRF9610/IRF620 I think there are several options.
Maybe even IRF9510/IRF510 which are 100V
I dont think it makes too much difference using
IRF510,520,530,610,620,630 and the IRF9xxx of the same.
There might be some TIPxx that can replace BD911/912 100V TO220
Should be at least 80V transistors, I think.
This is some of my thinkings
But I am not sure of this.
widowmaker and others will tell.