oneplustwo F5 build thread - Page 12 - 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 1st April 2012, 07:19 PM   #111
diyAudio Member
 
Join Date: Nov 2010
Location: Marblehead Ma
Quote:
Originally Posted by 6L6 View Post
They are genuine Bourns pots, yes? Start with them fully CCW

hmmmm doesn't the direction depend on which way you put them in ?
  Reply With Quote
Old 1st April 2012, 07:24 PM   #112
diyAudio Member
 
Join Date: Feb 2009
yes it does
you want to see 0ohm over R3/R4

Last edited by AudioSan; 1st April 2012 at 07:27 PM.
  Reply With Quote
Old 1st April 2012, 07:28 PM   #113
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Well, it only sorta depends on which way they were put in - the PCB does 'key' the pot in a certain direction. And CCW is CCW regardless of which way you look at it, or which way the pot is oriented.

Anyway, as Andrew said, if the light bulb rig glows really bright they are all the way the wrong way, or you have other problems.

You do have a Lightbulb rig, right? If you don't, you need to make a run to the local hardware store before you do anything else.

Click the image to open in full size.
  Reply With Quote
Old 1st April 2012, 07:36 PM   #114
diyAudio Member
 
Join Date: Feb 2009
ehm. point being that it depends on witch way the pot is, if adjustment gonna be CW or CCW.

Last edited by AudioSan; 1st April 2012 at 07:45 PM.
  Reply With Quote
Old 1st April 2012, 07:44 PM   #115
diyAudio Member
 
Join Date: Nov 2010
Location: Marblehead Ma
Quote:
Originally Posted by 6L6 View Post
Well, it only sorta depends on which way they were put in - the PCB does 'key' the pot in a certain direction. And CCW is CCW regardless of which way you look at it, or which way the pot is oriented.
not trying to make an issue out of this , but the pot can go in either way . the wiper ,pin 2 ,center pin will always go towards pin number 1 ccw and pin 3 cw . if you have the pot in one way ccw will decrease resistance . turn the pot 180 deg and ccw will increase resistance .

that's why you ALWAYS need to check with a meter . NOT by just turning it all the way any one way .

cheers Woody
  Reply With Quote
Old 1st April 2012, 08:24 PM   #116
diyAudio Member
 
oneplustwo's Avatar
 
Join Date: Apr 2009
Location: San Francisco
Quote:
Originally Posted by Woody1911a1 View Post
not trying to make an issue out of this , but the pot can go in either way . the wiper ,pin 2 ,center pin will always go towards pin number 1 ccw and pin 3 cw . if you have the pot in one way ccw will decrease resistance . turn the pot 180 deg and ccw will increase resistance .

that's why you ALWAYS need to check with a meter . NOT by just turning it all the way any one way .

cheers Woody
Exactly. Which brings us back to the issue of why my resistance number increases with time? Takes about 10 seconds till it reads open. If I read voltage for a little while it sort of resets. Weird.

Also, any comments on the psu PCB connection would be appreciated.

Thanks!
  Reply With Quote
Old 1st April 2012, 09:21 PM   #117
diyAudio Member
 
Andersonix's Avatar
 
Join Date: Jan 2004
Location: Silicon Valley, California
Quote:
Originally Posted by oneplustwo View Post
Exactly. Which brings us back to the issue of why my resistance number increases with time? Takes about 10 seconds till it reads open. If I read voltage for a little while it sort of resets. Weird.
Maybe the thermistors (TH1, TH2) are warming up and affecting the R?
  Reply With Quote
Old 1st April 2012, 11:36 PM   #118
diyAudio Member
 
oneplustwo's Avatar
 
Join Date: Apr 2009
Location: San Francisco
Quote:
Originally Posted by Andersonix View Post
Maybe the thermistors (TH1, TH2) are warming up and affecting the R?
Doubt it. They would warm up from what the DMM puts in? Also, shouldnt it just read what's going across the pot?
  Reply With Quote
Old 2nd April 2012, 12:01 AM   #119
diyAudio Member
 
Andersonix's Avatar
 
Join Date: Jan 2004
Location: Silicon Valley, California
My suggestion was based on your latest pics which appears to be a completed F5, so measuring across the pot will read everything that's across the meter probes -- which is the entire circuit...
  Reply With Quote
Old 2nd April 2012, 12:19 AM   #120
diyAudio Member
 
oneplustwo's Avatar
 
Join Date: Apr 2009
Location: San Francisco
Unfortunately, far from complete!

But you're right, it should measure everything in the completed circuit on the board. But not powered up as of yet.



Quote:
Originally Posted by Andersonix View Post
My suggestion was based on your latest pics which appears to be a completed F5, so measuring across the pot will read everything that's across the meter probes -- which is the entire circuit...
  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 06:32 PM
FS: Parts for F5 build Jimmy D. Swap Meet 2 5th July 2011 05:33 PM
ZM's (not) F5 thread Zen Mod The Lounge 87 26th March 2011 03:40 PM
Next suggested build after F5 anilva Pass Labs 36 3rd December 2010 05:11 AM
F5 Build Instructions 1108 Pass Labs 4 12th May 2009 11:58 PM


New To Site? Need Help?

All times are GMT. The time now is 04:05 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