Curly-F4 - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 29th January 2014, 01:25 AM   #11
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Dual 8" 10.08 profile from HeatsinkUSA per side would take the heat at bias up to 2.4A with 22V rails. Lot of heat, but difference between cumulative heat of all fets(majority of heat is external to get) vs heatsink fighting to get rid of high internal heat of fets. Already have output stage designed. Dropped it to finish other things.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 29th January 2014, 01:39 AM   #12
lhquam is offline lhquam  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys
Buzz: You handle the heat, I can supply the gain stage!
My Curllian-F4 PCB is actually fabricated as a pair of channels that have interconnects for balanced operation. The entire pair can be mounted (somewhere) and fed to the balanced F4 pairs, or can be split, with wire (or pair) interconnecting for the "X-node".
  Reply With Quote
Old 29th January 2014, 01:50 AM   #13
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
I had the funny^6 on a similar setup with 27V rails and 1A bias. 50W+ per sink, 100W per channel. I can see if we can configure a good working layout. All together, appx size of xa60.5.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 29th January 2014, 02:00 AM   #14
diyAudio Member
 
Join Date: Nov 2004
Location: manila,PH
lh,
Nice build, how was the sound compare to BA3 and Impasse?
__________________
Pinoy ikaw ay pinoy... ipakita sa mundo... kung ano ang kaya mo...

Last edited by rolandong; 29th January 2014 at 02:03 AM.
  Reply With Quote
Old 29th January 2014, 02:15 AM   #15
lhquam is offline lhquam  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys
Quote:
Originally Posted by rolandong View Post
lh,
Nice build, how was the sound compare to BA3 and Impasse?
It sounds great, and has NO audible noise with the ear against the speaker.

So far, my listening tests indicate no problems. I prefer the Impasse to the BA3GS, but I have not A/B tested the Curly4 vs. the Impasse. I have another, uncrippled F4, an Impasse, and a BA3GS. For A/B testing, all I need is switches between the amps and the speakers, and some way to equalize the gains.
  Reply With Quote
Old 29th January 2014, 02:29 AM   #16
diyAudio Member
 
Join Date: Nov 2004
Location: manila,PH
I'll look forward to hearing how it goes.
I got an Impasse+F4 parts here waiting but not much diy time
The LSK pre everyone's been looking at could mate with F4, too.

Thanks for sharing your build.
__________________
Pinoy ikaw ay pinoy... ipakita sa mundo... kung ano ang kaya mo...
  Reply With Quote
Old 29th January 2014, 06:54 AM   #17
henryve is offline henryve  South Africa
diyAudio Member
 
henryve's Avatar
 
Join Date: Jun 2008
Location: Strand
Stupid question maybe: where do the other ends of R62 and R63 tie to?
  Reply With Quote
Old 29th January 2014, 08:35 AM   #18
lhquam is offline lhquam  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys
Quote:
Originally Posted by henryve View Post
Stupid question maybe: where do the other ends of R62 and R63 tie to?
They tie to the ends of the trimmer pot, ie. the JFET source pins. I am not sure what resistance would be best.
  Reply With Quote
Old 29th January 2014, 08:57 AM   #19
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Quote:
Originally Posted by lhquam View Post
...The following preamp designs are also interesting, but do not produce 20 volt peak output...
For the truth's sake, the LSK pre does produce more than that. It's just a matter of few different PS and resistor values - look at the post #25 of the said thread (higher gain => tighter bandwidth and vice versa)...

Otherwise, nice build
  Reply With Quote
Old 29th January 2014, 01:00 PM   #20
lhquam is offline lhquam  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys
Quote:
Originally Posted by juma View Post
For the truth's sake, the LSK pre does produce more than that. It's just a matter of few different PS and resistor values - look at the post #25 of the said thread (higher gain => tighter bandwidth and vice versa)...

Otherwise, nice build
I stand corrected. With PS voltage and resistor values adjusted, there essentially no difference between my Curly gain stage and your LSK pre (without the output buffer). I need do look more carefully at the end-to-end square wave response to see if your use of an RC snubber might be useful.
  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
Minuet S52 Curly Cherry Veneer Clearwave Audio apoopoo999 Swap Meet 5 22nd August 2012 02:56 PM
FS: 2-way Curly Cherry (rare) SB Acoustics 5" and Scan Speak tweeter! A must see Jed Swap Meet 4 16th November 2011 12:04 AM
first watt f4 help me!!!! mosfet1 Pass Labs 2 18th May 2008 06:44 AM
F4 and DAC? Flecko Pass Labs 9 23rd February 2008 09:57 PM
FS Feeler: Curly maple component stands TurboFC3S Swap Meet 6 5th September 2006 06:34 PM


New To Site? Need Help?

All times are GMT. The time now is 06:58 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