diy MC-phonostage - Page 2 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, 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 5th August 2002, 11:50 AM   #11
diyAudio Member
 
Onvinyl's Avatar
 
Join Date: Aug 2002
Location: Germany
Default try no 2SK369

Hi NickC,
I tried those first in my mc-stage. They work, but lack bass and tightness. That is the experience of hifidaddy as well.

I wouldn't use them. This phonoamp is supposed to be a quite good one, really high grade.
My current design does not sound bad, though it is not a killer by now.
There are suggestions to try 2SK240 double-fet instead.
Rudiger
  Reply With Quote
Old 6th August 2002, 06:41 AM   #12
diyAudio Member
 
Join Date: Dec 2001
Location: Earth
how would you connect the circuit then? new to fets world (bjt user). Also some tips on preventing esd would be good? thanks
  Reply With Quote
Old 6th August 2002, 10:44 AM   #13
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Quote:
Originally posted by NickC
new to fets world (bjt user). Also some tips on preventing esd would be good? thanks
Every semiconductor are sensitive but some are more....

JFET's and BJT will normally not create much trouble but MOSFET's can be sensitive especially those with no gate protection what so ever. Small signal MOSFET's like BS170 are not protected. Also power fet's. Exception from that are Hitachis lateral types 2SJ50, 2SK135 and newer models. If you aren't sure, consult the datasheets.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy. Still time for signing up.
  Reply With Quote
Old 9th August 2002, 03:45 AM   #14
diyAudio Member
 
Join Date: Dec 2001
Location: Earth
anybody knows where to get the jfets 2sk170 GR model? and how to matched them.(circuit design would be great)
  Reply With Quote
Old 9th August 2002, 05:47 AM   #15
Banned
 
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Yes, but only if you want blues. 2SK147s, blue and probably violet.

Jocko
  Reply With Quote
Old 9th August 2002, 08:42 AM   #16
dice45 is offline dice45  Germany
diyAudio Member
 
Join Date: Jan 2002
Location: Munich, Bavaria
Rüdiger,

best hint for ceramic soldering strips i can give you: lay your hand on an old (non-functional) Tektronix oscilloscope and carefully dismantle, slaughter, butcher it. It is full of those strips.
Circuits: best avoid the side cutter at all and do it with your soldering iron.
Before i forget it: do it with respect and let the mastership of the Tek people how to do proper p2p wiring slowly soak in. Zen style

Use silver solder, it is needed for those Tek cermic soldering strips.
__________________
Greets,
Bernhard
  Reply With Quote
Old 3rd September 2002, 04:27 AM   #17
diyAudio Member
 
Join Date: Dec 2001
Location: Earth
is it possible to use more jfets at the begining of the circuit. it reduces more noise than using one jfet rite. but with have to add resistance to the source for equally distribution of load rite?
what value should it be? and at the output stage should more jfets be used (increase gain) similar to pass pearl. what are the benefits of my suggestion and disadvantages too
  Reply With Quote
Old 1st October 2002, 09:19 PM   #18
diyAudio Member
 
Morello's Avatar
 
Join Date: Jan 2002
Location: Sweden
Send a message via ICQ to Morello
I suggest that You implement a RF-filter at the input.
2k ohms in series and 100pF shunt to ground.

I have designed a RIAA-stage comprising one 2SK170 and one OPA2134 per channel. It works excellent with extremely low noisefloor.

Best regards\Morello
__________________
"It was never supposed to be a hit, it was supposed to be a Joe Morello drum solo"- Paul Desmond
  Reply With Quote
Old 21st October 2002, 10:23 AM   #19
Werner is offline Werner  Europe
diyAudio Member
 
Join Date: Jan 2002
Location: Belgium
Default 2sk240 datasheet

Does anyone have a 2sk240 datasheet? Seems to be a bit hard to find on the net.

Thanks,


W
  Reply With Quote
Old 21st October 2002, 11:21 AM   #20
jcarr is offline jcarr  United States
diyAudio Member
 
Join Date: Jul 2002
Location: Tokyo, Japan
Werner: I am pretty certain that the 2SK240 has been out of production for some years now, and this is likely why you cannot find a datasheet. From memory, this was a 40V medium-gm low-noise N device. The complementary was called the 2SJ75, I think.

Although I don't think I have a full data sheet, I probably have at least some basic numbers, so if you cannot find anything else, I'll go through my parts catalogs.

regards, jonathan carr
__________________
http://www.lyraconnoisseur.com/, http://www.lyraaudio.com
  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
freaky new phonostage Vinylsavor Tubes / Valves 35 30th November 2010 07:30 AM
PCB layout for phonostage robmil Solid State 13 14th January 2009 02:22 PM
phonostage with 150VDC B+ alexg Tubes / Valves 9 18th August 2007 01:13 AM
rjm 2 tube phonostage hacknet Analogue Source 6 10th April 2006 05:27 AM
phonostage design lt cdr data Analogue Source 1 20th April 2005 09:48 AM


New To Site? Need Help?

All times are GMT. The time now is 07:53 PM.


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