Gain in Aleph P 1.7 - 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 17th May 2004, 03:42 PM   #11
diyAudio Member
 
Join Date: Sep 2003
Location: New Jersey
Klaus:

If I put R49 into perspective, the gain is about 5 dB less than without it. That is, if my VR set to 150 ohms, then the gain:

without R49 is ~15dB
with R49 in the picture is ~10dB

In my current setting, I think without it is more correct when I test it with my ear... (but maybe I am wrong!)

Thomas
  Reply With Quote
Old 18th May 2004, 03:13 AM   #12
Account Disabled
 
Join Date: Aug 2002
Location: Near to the Pacific Ocean
Hi, Klaus

Yes, we have R49. But at the same time we have R64, too, on the opposite side. I think that they have a +/- zero effect. Therefore, I did not consider them in my gain consideration.

Mr Pass might give me a strong punch to .

Regards
  Reply With Quote
Old 18th May 2004, 02:16 PM   #13
Account Disabled
 
Join Date: Aug 2002
Location: Near to the Pacific Ocean
Quote:
Originally posted by bbakota2000

... this formula ...

dB ~ 20 x log((R53xR56/(R53+R56))/(R51+R66+2K pot set value))

JH
  Reply With Quote
Old 18th May 2004, 03:24 PM   #14
Klaus is offline Klaus  Germany
diyAudio Member
 
Join Date: May 2002
Location: near Frankfurt/Main
Quote:
Originally posted by jh6you


dB ~ 20 x log((R53xR56/(R53+R56))/(R51+R66+2K pot set value))

JH

Hi,

I just asked again my colleague, my personal chief for any analog schematics…

He explained my that the story is a bit of more complicated. The P1.7 has two overlaid gain settings. One given, like described, by the parallel value of R53/56/49 + the input R of the power amp in relation to R51+poti+R66. BUT we also have a voltage feedback given by R48 to the input. Here the gain is also limited. So the total gain to be calculated with both – but I did not understand how…

I am stranded, I go and listen music over my P1.7, however its gain is controlled…

Regards

Klaus
  Reply With Quote
Old 18th May 2004, 03:52 PM   #15
Account Disabled
 
Join Date: Aug 2002
Location: Near to the Pacific Ocean
I agree that the x-feedback registers, R48 and R63, take part of the overall amp gain control.

Regards

JH
  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
Gain Aleph 3 and Aleph L?? Nelson? Metric Pass Labs 1 10th April 2006 07:13 PM
Aleph 5 with no (few) gain ElectroNick Pass Labs 4 13th March 2005 01:08 PM
Aleph 30 gain Freddie Pass Labs 9 11th May 2002 03:02 AM
Aleph gain Koy Pass Labs 1 30th January 2002 10:55 AM


New To Site? Need Help?

All times are GMT. The time now is 01:51 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