2SK170 Hybride idea IRF610, 100 mA out - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 4th July 2008, 01:29 PM   #1
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Default 2SK170 Hybride idea IRF610, 100 mA out

Hi

Here is a FET - Bipolar - MOSFET hybride idea.
A powerful and very high performance preamplifier.
Yet very much KEEP IT SIMPLE


3 transistors only = JFET input, BJT VAS, MOSFET output.

This version uses 2SK170 input and IRF610 follower stage.

Following my Lineup philosophy of using separate voltage supply for each stage.
Something I have in common with a few other Hifi designers,
like eg. the eminent Mr. John Curl.

Any improvements suggestions and questions are welcome.
The simulated distortion shows nice falling harmonics at or below the -100dB level.
Worst sim test so far: 10 Vrms (+-14.1422 Volt peak ) into 2 kohm.
Neither does the distortion at 7 Vrms ( 10 Vpeak ) into 500 ohm show no problems.

Upper - 3 dB bandwidth is trimmed to 1 MHz ( 1000 kHz ).
Close to same frequency shows for -45 degrees phase.

Lineup
-------------------------------------

I assume that those want to try this amplifier knows
- how to make good CCS sources ( search forum )
- how to make 3 good voltage supplies, one for each stage ( search forum )
Attached Images
File Type: png lineup_hifi-pre-hybride_4a-irf610_3.png (3.4 KB, 1053 views)
  Reply With Quote
Old 4th July 2008, 11:27 PM   #2
diyAudio Member
 
Join Date: Jun 2008
Thats an super idea! you can feel that when you look at the responses of your post
I dont understand why you want to use the 2sk170 thist transistor isnt cheap and isnt easy to get, i think also that different power supplies for each stage isnt practical and dont give you a better result.
When you belive that, you belive in silver cables for 1000$ and CD ionisators for 300$ too.
There are alot good opamps like the NE5532... this opamp sounds better then 99% of the selfmade preamps.
Have fun!
  Reply With Quote
Old 5th July 2008, 06:30 AM   #3
diyAudio Member
 
nelsonvandal's Avatar
 
Join Date: Nov 2006
I can't understand how anyone can regard NE5532 as good sounding. It sounds decent, not more than that. It has a kind of "harmless" but dull sound. Even the boring OPA2132 sounds more exciting. I'd be surprised if any monolithic opamp could give a circuit such as this a match.

BTW, in Sweden a 2SK170 is about 1 USD. Expensive?
  Reply With Quote
Old 5th July 2008, 08:02 AM   #4
diyAudio Member
 
Join Date: Jul 2001
Location: The Netherlands
Default Re: 2SK170 Hybride idea IRF610, 100 mA out

Quote:
Originally posted by lineup
Hi

Here is a FET - Bipolar - MOSFET hybride idea.
A powerful and very high performance preamplifier.
Yet very much KEEP IT SIMPLE


3 transistors only = JFET input, BJT VAS, MOSFET output.

This version uses 2SK170 input and IRF610 follower stage.

Following my Lineup philosophy of using separate voltage supply for each stage.
Something I have in common with a few other Hifi designers,
like eg. the eminent Mr. John Curl.

Any improvements suggestions and questions are welcome.
The simulated distortion shows nice falling harmonics at or below the -100dB level.
Worst sim test so far: 10 Vrms (+-14.1422 Volt peak ) into 2 kohm.
Neither does the distortion at 7 Vrms ( 10 Vpeak ) into 500 ohm show no problems.

Upper - 3 dB bandwidth is trimmed to 1 MHz ( 1000 kHz ).
Close to same frequency shows for -45 degrees phase.

Lineup
-------------------------------------

I assume that those want to try this amplifier knows
- how to make good CCS sources ( search forum )
- how to make 3 good voltage supplies, one for each stage ( search forum )

Nice ... looks like the Threshold NS-10 has married a low noise SK170 and a Psslabs IRF610.. should work excelent if you ask me...... and would be a nice headphone amplifier too!
  Reply With Quote
Old 5th July 2008, 08:37 AM   #5
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Hello Lineup,
Your circuit has that "it looks right" feel to it You know- that inexplicable thing. I am sure it would sound great too !!!
  Reply With Quote
Old 6th July 2008, 04:18 AM   #6
diyAudio Member
 
Join Date: Jun 2008
Yes i am shure too, i often **** on my amp that even sonds much better
  Reply With Quote
Old 7th July 2008, 09:19 AM   #7
h_a is offline h_a  Europe
diyAudio Member
 
h_a's Avatar
 
Join Date: Sep 2006
Location: Graz, Austria
Hi Lineup!

Nice to see you posting nice little amps here!

However I do have a few questions: different rails are used to be able to run the outputs close to the rail, but your third rail of 41.5V seems to be useless here as it only drives a voltage divider?

The 50V for the frontend are also far higher than needed to run the output to the rail - but no harm. By the way did you check power dissipation for the K170? Seems only a GR could fit here.

As component values are missing I cannot say for sure, but it seems that you may get rid of the input coupling cap (if you want that is).

Of course you can also plug an Aleph Current source into it and get rid of the output cap as well ;-)

All the best and happy building, Hannes
  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
DIY Planar magnetic Hybride WrineX Planars & Exotics 71 9th August 2012 01:48 PM
IRF610 IRF9610 2SK170 2SJ74 PCM63k CS8412 SM5842 for sale Ruach Swap Meet 139 11th April 2011 06:20 PM
bridged UcD-like hybride Kuzmenko Class D 3 5th July 2009 08:27 PM
mugen hybride jopie Tubes / Valves 2 2nd April 2008 04:09 PM
DIY Hybride amplifiers Gydotron Tubes / Valves 21 22nd February 2005 03:37 PM


New To Site? Need Help?

All times are GMT. The time now is 01:40 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