2sk135 2sj50 - Page 3 - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th April 2003, 02:08 PM   #21
Patrick is offline Patrick  New Zealand
diyAudio Member
 
Patrick's Avatar
 
Join Date: Apr 2003
Location: Hamilton
that sound about right, thanks for that info,

the input GND to output GND is 10.5 ohms.
  Reply With Quote
Old 13th April 2003, 05:25 PM   #22
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Default The mono amp...

Quote:
Input signal is the right one and common the left one. Is the screen on the input cable connected to the left one? (if it isn't that is weird)
No... the amp is a mono amp (for a monobloc pair)...so the input is right!

If the amp was Stereo it will need two speakers outputs also...

To Patrick:
Input is correct
Connect power supply + to the board +
" " " - " " " -
" the + of the loudpeaker to the output side of the inductor
" " power supply ground to the ground connection near the output inductor
And connect the - of the loudspeaker to the power supply ground...or to the point that connect the power supply ground to the board!!(this depend of the implementation of the circuit!!)

But please...short connections!!

After enjoy the music!!!

Cheers
__________________
Jorge
  Reply With Quote
Old 13th April 2003, 07:39 PM   #23
diyAudio Member
 
megajocke's Avatar
 
Join Date: Jan 2003
Default Re: The mono amp...

Quote:
Originally posted by Tube_Dude


No... the amp is a mono amp (for a monobloc pair)...so the input is right!

If the amp was Stereo it will need two speakers outputs also...
<snip>

I meant that the right hole is input signal, and the left one is input ground. Not something with left and right inputs
  Reply With Quote
Old 13th April 2003, 07:50 PM   #24
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Default A language issue...

Hi Megajocke!!

Sorry!!!...i haven't understand you right!!

Is because we both aren't talking our native languages...

Cheers
__________________
Jorge
  Reply With Quote
Old 14th April 2003, 05:52 AM   #25
Patrick is offline Patrick  New Zealand
diyAudio Member
 
Patrick's Avatar
 
Join Date: Apr 2003
Location: Hamilton
thanks for the reply's.

i knew that this was a monoblock. the real problem that i was trying to solve was which out of all those wires was +ve power, -ve power, GND and audio output.

i have now solved this problem thanks to pinkmouse.

just one question, what setting should i have the POT (one in the center of the bord) set at (ie what volts).

other than that this amp makes quite a good sub amp.

thanks for all you input.
  Reply With Quote
Old 14th April 2003, 09:50 AM   #26
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
The pot is probably for adjusting the bias current- to do that you will need advice from someone who knows the mosfets. I don't, sorry.

But if it works well, and doesn't run too hot, you can probably leave it for a while.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 14th April 2003, 12:16 PM   #27
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Default The "biased" pot...

Quote:
Originally posted by pinkmouse
The pot is probably for adjusting the bias current- to do that you will need advice from someone who knows the mosfets.

Yes the pot is probably for adjusting the bias current or for adjusting the of set voltage...only the schematic can tell ..but i bet that is for bias adjustment...!

The typical bias currents for 2SK135/2SJ50 are 100mA per device...
__________________
Jorge
  Reply With Quote
Old 14th April 2003, 07:51 PM   #28
diyAudio Member
 
megajocke's Avatar
 
Join Date: Jan 2003
Default 2sk227 2sj83

Does anyone know anything more about these transistors? They seem to be similar to 2SK135/2SJ50. I can't find any datasheets.

2SK227: 160V, 7A, 100W
2SJ83: 160V, 7A, 100W
Attached Images
File Type: jpg mosfets.jpg (67.8 KB, 455 views)
  Reply With Quote
Old 27th December 2003, 01:24 AM   #29
diyAudio Member
 
universum's Avatar
 
Join Date: Dec 2003
Location: Near Amsterdam
Talking 2SK....

Hi Akersa,

The replacements of the 2SK135 and the 2SJ50 are
the 2SK1058 and the 2SJ162.
They are nearly the same(from specs)but not so in service so look for the good bias...Prefer the old TO-3 ones(for sound and shielding),altough the flat-ones better mount:-))
The picture that Patrick shows is one of the cresendo from elektor...they had a miniversion (about half the size of the cresendo)
They recommended a current of 100 mA(measured by the 5 resistors of 1 ohm at their sources..)i would settle for 800mA,if you have a big enough cooling!!
They run very hot,but still work,after more then 20 years of service..idle still the same as then..nothing changed..yet...

Happy listening!
__________________
Vision is the Art of seeing things invisable.
  Reply With Quote
Old 27th December 2003, 04:10 AM   #30
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
Quote:
Originally posted by peranders
The K135/J50 are rather special, they have constant gm over a certain current! This is good for linearity but bad for output impedance.
Hi,

what is gm ? And in which area of current ?


Bernhard
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Nos Hitachi (20) 2sj50 (20) 2sk135 ashbytub Swap Meet 4 21st March 2012 05:34 PM
2sk135 2sj50 matching muizel Parts 24 13th March 2011 06:26 PM
sub for 2sj50/2sk135 sasha Solid State 20 27th March 2008 04:28 PM
2sj50/2sk135 jean-paul Swap Meet 0 26th February 2006 10:16 PM
I need 2sk135 and 2sj50 DJG Swap Meet 32 7th February 2006 10:03 PM


New To Site? Need Help?

All times are GMT. The time now is 03:03 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2