Low TIM, low distortion hybrid front-end - 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 19th June 2014, 09:32 AM   #1
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Send a message via Skype™ to vzaichenko
Lightbulb Low TIM, low distortion hybrid front-end

Hi All,

Here is my new "baby". Front-end with a vacuum tube IPS.

It is based on one of my previous (prototyped and tested) designs, with certain improvements implemented. Simulation shows very high parameters, promising a good sound.

Anybody interested in further development?

Cheers,
Valery
Attached Images
File Type: jpg @vz-tube-01.JPG (808.2 KB, 1494 views)
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
  Reply With Quote
Old 19th June 2014, 01:02 PM   #2
diyAudio Member
 
Join Date: Apr 2013
Hi Valery

This looks rather interesting. Can you explain the function of Q10 - Q13?

Do you plan to do a PCB layout for this?
  Reply With Quote
Old 19th June 2014, 02:20 PM   #3
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Blog Entries: 2
Agree - looks interesting.

What are the advantages of this over an all SS version, i.e. same topology but say, JFET instead of triode ?
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 19th June 2014, 02:45 PM   #4
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Send a message via Skype™ to vzaichenko
Quote:
Originally Posted by Ranchu32 View Post
Hi Valery

This looks rather interesting. Can you explain the function of Q10 - Q13?

Do you plan to do a PCB layout for this?
Hi Christian,

Q10-Q13 is a balanced VAS with current mirror. I tried to illustrate the principle on the attached picture. I'm not a good "artist", but hope it gives an idea of how it works

Yes, I started working on PCB.

Cheers,
Valery
Attached Images
File Type: jpg Balanced VAS principle.JPG (50.8 KB, 1270 views)
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
  Reply With Quote
Old 19th June 2014, 05:41 PM   #5
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Don't start with valves, I've always been curious about the little glowing things used as a small signal front end >.< Trouble is I'd want them visible haha.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 19th June 2014, 05:46 PM   #6
diyAudio Member
 
still4given's Avatar
 
Join Date: Oct 2004
Location: Victorville, CA
In case I wasn't clear in the Slewmaster thread, I am very interested.

Blessings, Terry
  Reply With Quote
Old 19th June 2014, 05:59 PM   #7
diyAudio Member
 
Join Date: Dec 2004
Location: Bakersfield, CA
Me too. I want to see more.
__________________
Best Regards,
Carl Huff
  Reply With Quote
Old 19th June 2014, 09:47 PM   #8
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Send a message via Skype™ to vzaichenko
Quote:
Originally Posted by Bigun View Post
Agree - looks interesting.

What are the advantages of this over an all SS version, i.e. same topology but say, JFET instead of triode ?
Thinking about IPS LTP, I'd like to have it low-noise, highly linear and rather tolerant to high in-phase signal swing. Tube triod is actually good in all three areas. JFETs are good in SnR, but often less linear. MOSFETS are good in linearity, but not so good in SnR. So I decided to go with the best option available - give it a try and see if it really influences sonic qualities.

Attached is a similar output RMS as shown at the previous picture (also 20KHz), but open loop. Pretty much linear for 83db gain. Looks very promising.
Attached Images
File Type: jpg @vz-tube-02-OL-20K.JPG (542.2 KB, 948 views)
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
  Reply With Quote
Old 19th June 2014, 10:11 PM   #9
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Send a message via Skype™ to vzaichenko
Post Schematic

As requested - here is the schematic in both .jpg and .pdf

The node in the circle must be broken-up and connected to the power module as appropriate (it is here just for testing with no OPS purposes).

I started developing the PCB - coming soon. I am also very interested in prototyping this
Attached Images
File Type: jpg Tube-hybrid-sch.jpg (125.7 KB, 964 views)
Attached Files
File Type: pdf Tube-hybrid-sch.pdf (126.5 KB, 101 views)
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
  Reply With Quote
Old 19th June 2014, 10:16 PM   #10
diyAudio Member
 
Join Date: Dec 2004
Location: Bakersfield, CA
Okay, you've hooked me now. I am looking forward to seeing your PCB layout. I just may have to build this!
__________________
Best Regards,
Carl Huff
  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
2nd amp from scratch: Low NFB- FET front end - BJT OPS Bensen Solid State 40 20th August 2014 10:07 PM
Low power efficient amp for small low end speaker xluke Chip Amps 3 10th April 2014 08:17 PM
ultra low noise low distortion preamplifier needed neazoi Solid State 13 11th October 2011 02:03 PM
Low TIM, How to verify it!!! thanks a lot!! mclarenpingu Solid State 10 19th March 2008 02:39 PM
Best low-noise low-distortion buffer? borges Solid State 7 9th December 2003 01:40 PM


New To Site? Need Help?

All times are GMT. The time now is 09:48 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