Go Back   Home > Forums > >

Solid State Talk all about solid state amplification.

Sons of VHex
Sons of VHex
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
Old 25th July 2016, 12:07 AM   #1
vzaichenko is offline vzaichenko  Russian Federation
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Sons of VHex
Arrow Sons of VHex

Hi All,

Me and Jeff decided to start a separate thread on the amps, based on original VHex.
Here is the first one - VHex+BT (BiTurbo).
Key differences with original VHex:
- slightly updated front-end - symmetric current-drive, providing higher speed and linearity;
- bootstrapped drivers, allowing higher output swing with the same rails;
- no bias spreader - thermal feedback is provided by the drivers.

At the moment this design is fully prototyped and live tested (see the measurements, screenshots and pictures).

Its a kind of CFA-fast VFA, having excellent step response, clean clipping close to the rails and pretty good distortion profile.

The sound is excellent to my taste - very natural, full of micro-details, having articulated, rich bass at the same time.
PCBs and kits are available.

The other design in the family - VTrench - same size PCB with OPS "on steroids" will follow soon (same level of quality at some 300W output power).
Stay tuned!

Cheers,
Valery
Attached Images
File Type: jpg 00-VHex+BT-Sch.jpg (155.3 KB, 3525 views)
File Type: jpg 01-Bode-10Hz-100KHz.JPG (104.3 KB, 3335 views)
File Type: jpg 02-THD-01K-50W.JPG (288.5 KB, 2976 views)
File Type: jpg 02-THD-10K-50W.JPG (277.7 KB, 2777 views)
File Type: jpg 02-THD-20K-50W.JPG (275.3 KB, 2626 views)
File Type: jpg DSC_0400.JPG (443.4 KB, 449 views)
File Type: jpg DSC_0402.JPG (478.9 KB, 365 views)
File Type: jpg DSC_0404.JPG (474.2 KB, 413 views)
File Type: jpg VHex+BT Prototype 01.jpg (183.0 KB, 1211 views)
File Type: jpg YHex+BT AC Sweep.jpg (58.2 KB, 1146 views)
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
http://vzaudio.com/ | http://airplay.zone/ - DIY goes wireless!
  Reply With Quote
Old 25th July 2016, 01:02 AM   #2
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Sons of VHex
That looks very nice Valery. Can you please highlight which part of the IPS is different?
  Reply With Quote
Old 25th July 2016, 01:02 AM   #3
jwilhelm is online now jwilhelm  Canada
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
Here's a teaser of the VTrench. I have a tester running on a scrap of aluminum with a measly +/- 70V supply feeding it. Valery described the sound perfectly in the previous post. "Very natural, full of micro-details, having articulated, rich bass at the same time." I'm very impressed with the sound and the power of this little amp. Proper testing is awaiting some heatsink and a supply worthy of this thing.
Attached Images
File Type: jpg 2016-07-24 12.41.40.jpg (1,009.9 KB, 1093 views)
  Reply With Quote
Old 25th July 2016, 01:08 AM   #4
andrewlebon is offline andrewlebon  India
diyAudio Member
 
andrewlebon's Avatar
 
Join Date: Feb 2008
Hello vzaichenko
greetings very nice high end amplifiers is it possible for you to post
clear schematic of VHEX+ SCHEMATIC
warm regards
Andrew
__________________
"It's Better to try and fail than to never know and always wonder"
  Reply With Quote
Old 25th July 2016, 01:11 AM   #5
andrewlebon is offline andrewlebon  India
diyAudio Member
 
andrewlebon's Avatar
 
Join Date: Feb 2008
IXTK 120N25 monster mosfet
__________________
"It's Better to try and fail than to never know and always wonder"
  Reply With Quote
Old 25th July 2016, 01:17 AM   #6
jwilhelm is online now jwilhelm  Canada
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
Quote:
Originally Posted by andrewlebon View Post
IXTK 120N25 monster mosfet
The "red haired step brother with the attitude problem" of the VHex family. It is a little monster!
  Reply With Quote
Old 25th July 2016, 02:01 AM   #7
Ranchu32 is offline Ranchu32  Australia
diyAudio Member
 
Join Date: Apr 2013
Hi Valery

Congratulations on another successful project!

Is there any particular reason why you return the collectors of the folded drivers to the rails instead of the output node? When strapped to the output, the drivers pass very little Vce and you can use high speed, very high gain small signal transistors to take advantage of the HexFet's speed and reduce loading on the VAS even more. I first saw this technique demonstrated by Bob Cordell and I've used it very successfully in a couple of my projects.
  Reply With Quote
Old 25th July 2016, 02:15 AM   #8
still4given is offline still4given  United States
diyAudio Member
 
still4given's Avatar
 
Join Date: Oct 2004
Location: Victorville, CA
Sons of VHex
Are your designs all becoming 2 sided layouts now?
  Reply With Quote
Old 25th July 2016, 05:06 AM   #9
Ranchu32 is offline Ranchu32  Australia
diyAudio Member
 
Join Date: Apr 2013
Quote:
Originally Posted by andrewlebon View Post
IXTK 120N25 monster mosfet
I don't understand how to take advantage of the enormous power dissipation (Pd = 730W!) claimed in the datasheet for this "monster mosfet". Even assuming an infinitely large aluminum heat sink, the thermal resistance between that TO-264 heat spreader and the heat sink is going to make it impossible to dissipate all those watts without the junction temperature soaring sky high!
  Reply With Quote
Old 25th July 2016, 05:35 AM   #10
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Sons of VHex
Quote:
Originally Posted by Ranchu32 View Post
I don't understand how to take advantage of the enormous power dissipation (Pd = 730W!) claimed in the datasheet for this "monster mosfet". Even assuming an infinitely large aluminum heat sink, the thermal resistance between that TO-264 heat spreader and the heat sink is going to make it impossible to dissipate all those watts without the junction temperature soaring sky high!
Heatpipes and water cooling!!!
  Reply With Quote

Reply


Sons of VHexHide this!Advertise here!
Thread Tools

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS:: VHEX+ amplifier built and tested PauloPT Swap Meet 11 20th July 2016 09:11 AM
Sons of Zen: The Modular Power Amplifier rsdio Pass Labs 9 3rd December 2011 07:58 PM
My sons' band mobileusa Music 2 16th December 2009 03:56 PM
Looking for a DIY PA system for my sons Garage Band airframe Instruments and Amps 24 30th June 2006 04:20 AM


New To Site? Need Help?

All times are GMT. The time now is 10:43 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki