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 23rd September 2013, 01:19 PM   #11
12B4A is offline 12B4A  United States
diyAudio Member
 
12B4A's Avatar
 
Join Date: Aug 2012
Location: Right here, on this screen
The gain change is not going to make a meaningful difference. If you feel it doesn't have enough volume as is then you're going to want an amp with 2 to 10 times more power.
  Reply With Quote
Old 23rd September 2013, 01:27 PM   #12
flg is offline flg  United States
diyAudio Member
 
flg's Avatar
 
Join Date: Jul 2005
Location: North East
I'm not even sure where I got that from but, I think it was a real figure people were getting some time in the past
__________________
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
  Reply With Quote
Old 23rd September 2013, 01:30 PM   #13
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
To get 14.28Vac instead of 12Vac output from the F5 you need to change the four 100r to 123r. You could try 130r or 120r and see if you hear any difference.
__________________
regards Andrew T.
  Reply With Quote
Old 23rd September 2013, 01:45 PM   #14
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
The overall gain through the INPUT Filter and the amplifier will be a bit lower than the amp's basic gain.
The attenuation of the RF Input Filter will depend on the Rin (series) used in the RF filter.

That would account for lower reported overall gain values and would also account for different reported values.

The basic gain of the amp is 6times.
A 1k series resistor feeding into 100k for Rin, reduces the overall gain to 15.48dB, cf. basic gain = 15.56dB
__________________
regards Andrew T.

Last edited by AndrewT; 23rd September 2013 at 01:51 PM.
  Reply With Quote
Old 24th September 2013, 09:37 PM   #15
Hikari1 is offline Hikari1  United States
diyAudio Member
 
Join Date: Jun 2012
Location: Seattle
My f5 w/91db 8ohm speakers, Cd player and passive pre had enough volume w/200ohm feedback resistors. Not enough volume for use w/my vinyl setup though.

Switched to a Jfet BOZ and 100 ohm feedback resistors. It was the right choice I think.

Even though the F5/200ohm resistor/passive setup had enough gain and volume it seemed to lack punch and dynamics. All was cured when I went to the 100ohm feedback resistors and a preamp. You gain weight and dynamics and lose a little mid-range purity and detail. But it's worth it.
  Reply With Quote
Old 24th September 2013, 10:38 PM   #16
tinitus is offline tinitus  Europe
diyAudio Moderator
 
Join Date: Nov 2005
a little preamp gain will probably make it sound 'harder'
you might hear that as being more dynamic
right or not, some multiway speaker may need that little exstra to sound 'more alive'

but in that case, maybe tone controls or some form of EQ would be even better
__________________
sometimes we know very little, and sometimes we know too much
  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
How to build the F5 6L6 Pass Labs 1133 23rd January 2014 05:32 PM
Which F5 to build? Mark Bartley Pass Labs 12 8th March 2013 12:31 AM
F5 build fred0 Pass Labs 31 21st October 2012 09:47 AM
Fresh F5 Build willamp Pass Labs 25 4th July 2012 03:12 PM
Next suggested build after F5 anilva Pass Labs 36 3rd December 2010 04:11 AM


New To Site? Need Help?

All times are GMT. The time now is 11:22 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