Go Back   Home > Forums > >

Pass Labs This forum is dedicated to Pass Labs discussion.

Dreaming of a DIY power amp
Dreaming of a DIY power amp
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 2nd March 2021, 01:43 PM   #51
peppennino is offline peppennino  Italy
Galactic hitchhiker
diyAudio Member
 
peppennino's Avatar
 
Join Date: Oct 2005
Location: παν-όρμος
Dreaming of a DIY power amp
Quote:
Originally Posted by Giovanni1968 View Post
We are 'talians from the south, harder than the others to convince...

So which would you pick as easy to start with and eventually upgrade later of if confident with the assembly and result?


I'd go for J or F4, absolutely keepers, even if you would switch to other FW boards in the future
__________________
Papa abides.
  Reply With Quote
Old 2nd March 2021, 01:56 PM   #52
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Dreaming of a DIY power amp
solder'n'plug'n'play - M2

solder'n'set a little'n'plug'n'play - F4, especially considering SP9 preamp swing (which is probably sole good thing SP9 is having )
__________________
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 2nd March 2021, 04:00 PM   #53
Giovanni1968 is offline Giovanni1968  Italy
diyAudio Member
 
Join Date: Oct 2016
Location: Capri
Quote:
Originally Posted by peppennino View Post


I'd go for J or F4, absolutely keepers, even if you would switch to other FW boards in the future
Okkey Peppí I will give a read at the F4 specs but since I am no tech would you mind as a fellow Borbonic to summarise for me pros and cons of j4 vs F4 vs F5?


Grazie cumpá

Giovanni
  Reply With Quote
Old 2nd March 2021, 04:00 PM   #54
Giovanni1968 is offline Giovanni1968  Italy
diyAudio Member
 
Join Date: Oct 2016
Location: Capri
Quote:
Originally Posted by Zen Mod View Post
solder'n'plug'n'play - M2

solder'n'set a little'n'plug'n'play - F4, especially considering SP9 preamp swing (which is probably sole good thing SP9 is having )

Ahah, and I thought the SP9 being the almost only piece worth keeping in my sound system
  Reply With Quote
Old 2nd March 2021, 04:08 PM   #55
peppennino is offline peppennino  Italy
Galactic hitchhiker
diyAudio Member
 
peppennino's Avatar
 
Join Date: Oct 2005
Location: παν-όρμος
Dreaming of a DIY power amp
Quote:
Originally Posted by Giovanni1968 View Post
Okkey Peppí I will give a read at the F4 specs but since I am no tech would you mind as a fellow Borbonic to summarise for me pros and cons of j4 vs F4 vs F5?


Grazie cumpá

Giovanni
With your preamp I' probably go for F4 too.
Have a look here:
Sound of various Pass amps

Saluti isolani
__________________
Papa abides.
  Reply With Quote
Old 2nd March 2021, 04:21 PM   #56
peppennino is offline peppennino  Italy
Galactic hitchhiker
diyAudio Member
 
peppennino's Avatar
 
Join Date: Oct 2005
Location: παν-όρμος
Dreaming of a DIY power amp
And here:
Sound of various Pass amps

According to those who built F4, it is very neutral and follow the qualities of the preamplifier. In needs more swing than others because it has no voltage gain.
__________________
Papa abides.
  Reply With Quote
Old 2nd March 2021, 05:53 PM   #57
Giovanni1968 is offline Giovanni1968  Italy
diyAudio Member
 
Join Date: Oct 2016
Location: Capri
@peppennino almost got me sold on the F4, as many of you suggested it seems it would make it worth keeping the SP9 (even tho it doesn't have a black face which I am 100% sure sounding better than my silver face one).

Gonna read the pdf and try and make up my mind

Grazie
  Reply With Quote
Old 2nd March 2021, 06:03 PM   #58
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Dreaming of a DIY power amp
F4 would allow full potential of your SP9 to shine, simply because F4 is not having voltage gain ....... that means that for full blast , preamp must deliver that on input of F4

that also means that F4 is not having much character of its own, resulting that preamp is dominant in amplification chain, sound wise

read pdf
__________________
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 2nd March 2021, 07:06 PM   #59
Giovanni1968 is offline Giovanni1968  Italy
diyAudio Member
 
Join Date: Oct 2016
Location: Capri
Quote:
Originally Posted by Zen Mod View Post
F4 would allow full potential of your SP9 to shine, simply because F4 is not having voltage gain ....... that means that for full blast , preamp must deliver that on input of F4

that also means that F4 is not having much character of its own, resulting that preamp is dominant in amplification chain, sound wise

read pdf
Just did a couple hours ago and then called my friend in Napoli (pizza?) who confirmed being available to help and about FW being worth.

Peppe, would you help me arrange a shopping list so I can figure where would I end?

Grazie
  Reply With Quote
Old 2nd March 2021, 07:19 PM   #60
william2001 is offline william2001  United States
diyAudio Member
 
william2001's Avatar
 
Join Date: Sep 2001
Location: Excelsior Springs, Missouri
Dreaming of a DIY power amp
The TL431 is a critical part in the F4 for proper operation, not all are the same. I recommend this part: NCP431ACLPRAG

And most people end up lowering the value of R9 to get the bias current where you want it. I have a 5K there.
__________________
  Reply With Quote

Reply


Dreaming of a DIY power ampHide 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
Dreaming of EZ DIY concrete enclosures? Your prayers have been answered! mosconiac Multi-Way 4 10th March 2013 10:49 PM
Dreaming of a power JFET complimentary pair. JZatopa Pass Labs 7 12th January 2012 10:40 AM
Night dreaming? / Middle of the night bloom Gabevee Tubes / Valves 54 25th July 2004 04:36 AM
Dreaming of owning DIY-Loudspeaker store sianturi Multi-Way 11 16th July 2002 04:03 AM


New To Site? Need Help?

All times are GMT. The time now is 10:30 AM.


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