F5 power amplifier - Page 161 - 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 11th August 2008, 03:06 PM   #1601
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Play leading wire ?
__________________
The buck stops Here
  Reply With Quote
Old 11th August 2008, 06:30 PM   #1602
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally posted by jacco vermeulen
Play leading wire ?

grumpy ?

bad weather for sailing , in Dutchland ?
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 15th August 2008, 02:27 PM   #1603
DUC985 is offline DUC985  Germany
diyAudio Member
 
Join Date: Oct 2004
Location: NRW
Default Some F5 impression

after one week of listening sessions, the overall sound impression is very nice. The F5 has no hum, no turn on thumb and is dead quite.
I think i like it even more than my tube amps. DC stays at around 5mv and is pretty stable. I can encourage everybody to build this great amp. Thanks to Nelson for bringing again a fantastic design to everybody. This amp will for sure stay a long time.

I have run with a tube pre, with the B1 and with an Aleph P as preamp. I'm a little bis dissapointed with the B1 / F5 combination.
gain is not issue, but the B1 sounds a little bit lean and the voices are not what i like. The Aleph P is clearly better in my setup with the F5 the overall sound is smooth as silk with a better tonal balance.
I still need to try the UGS F5 combination.

some picutures (The Alpeh P case still to build)
Attached Images
File Type: jpg f5.jpg (89.1 KB, 1975 views)
  Reply With Quote
Old 15th August 2008, 02:29 PM   #1604
DUC985 is offline DUC985  Germany
diyAudio Member
 
Join Date: Oct 2004
Location: NRW
Default F5 impression part 2

Speakers used, Onken with tractrix TAD 2002
Attached Images
File Type: jpg komplett.jpg (69.6 KB, 1767 views)
  Reply With Quote
Old 15th August 2008, 02:30 PM   #1605
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Default Re: F5 impression part 2

Quote:
Originally posted by DUC985
after one week of listening sessions, ........

some picutures (The Alpeh P case still to build)

Quote:
Originally posted by DUC985
Speakers used, Onken with tractrix TAD 2002

fugly!

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 15th August 2008, 02:32 PM   #1606
DUC985 is offline DUC985  Germany
diyAudio Member
 
Join Date: Oct 2004
Location: NRW
Default part 3

the Aleph P in the works
Attached Images
File Type: jpg aleph1.jpg (96.2 KB, 1888 views)
  Reply With Quote
Old 15th August 2008, 02:38 PM   #1607
diyAudio Member
 
vdi_nenna's Avatar
 
Join Date: Oct 2000
Location: PA, USA
Blog Entries: 1
Send a message via Yahoo to vdi_nenna
Hi, Nice amp build DUC985!

What size transformers are you using in your F5? Voltage and current?

Thanks,

Vince
__________________
I build, therefore I am.
  Reply With Quote
Old 15th August 2008, 02:56 PM   #1608
DUC985 is offline DUC985  Germany
diyAudio Member
 
Join Date: Oct 2004
Location: NRW
Default Transformer

two 350VA 18Volt AC giving about +- 24.8 Volts DC for the F5.
They are from RS Electronics nicely potted and quite. Those are the biggest you can get there, at least of this type.
  Reply With Quote
Old 15th August 2008, 03:10 PM   #1609
diyAudio Member
 
vdi_nenna's Avatar
 
Join Date: Oct 2000
Location: PA, USA
Blog Entries: 1
Send a message via Yahoo to vdi_nenna
So they are over 9 amps capable each?

I'm asking because I have 2- 18v+18v, 6.67amp transformers.
Just wondering if they are enough.

Thanks,

Vince
__________________
I build, therefore I am.
  Reply With Quote
Old 15th August 2008, 03:19 PM   #1610
udailey is offline udailey  United States
diyAudio Member
 
Join Date: Mar 2008
Nobody reads the article anymore. Like a passing fad.
http://www.firstwatt.com/articles.htm
or more directly
http://www.firstwatt.com/downloads/F...%20PassDIY.pdf
Then if you want power supply info
http://www.firstwatt.com/downloads/powersupply.pdf
And if you go to the product pages of FirstWatt you can view the info on F5 which has a more complete owners manual that includes the supply schematic.
http://www.firstwatt.com/downloads/F5-om_sm-080527.pdf

Nelson says:

The power supply of the tested amplifier is +/-24 volts and should be rated at 6 amps continuous duty, and more than 10 amps peak per channel. Ordinary unregulated supplies will work fine, and if you need suggestions the Zen Variations #5 (AudioXpress, October 2003) and Zen Variations #3 (AudioXpress, August 2002) both have good
examples of regulators and the raw supplies that feed them. I recommend rail voltages from 23 to 25 volts.
  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
Rockford Fosgate Power 20001 bd amplifier power rating?? pachoorion Car Audio 8 8th May 2011 10:49 PM
Power transformers versus amplifier output power..what is your option? destroyer X Solid State 38 9th May 2009 05:23 PM
McIntosh Power Amplifier Power Guard johnnyrt Solid State 2 23rd August 2007 10:22 PM
Output power for a power amplifier Progg70 Solid State 33 10th September 2006 08:44 AM
Amplifier 3000 Wats Rms Power + Smps Higcht Power Bestiality MARAVILLASAUDIO Class D 1 5th November 2004 04:06 PM


New To Site? Need Help?

All times are GMT. The time now is 01:57 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