B1 preamp build thread - Page 3 - 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 4th July 2012, 04:37 AM   #21
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Looks good!

Where did you get the rotary switches for the selector and attenuator?
  Reply With Quote
Old 4th July 2012, 04:48 AM   #22
PKI is offline PKI  United States
diyAudio Member
 
PKI's Avatar
 
Join Date: Aug 2011
partsconnexion.com. I experimented with log volume control, but it was not worth it, log is useful only after 10-11 o'clock.
This is how it started:
Click the image to open in full size.
  Reply With Quote
Old 4th July 2012, 04:54 AM   #23
PKI is offline PKI  United States
diyAudio Member
 
PKI's Avatar
 
Join Date: Aug 2011
Click the image to open in full size.
Compact in size, but not in sound :-)
  Reply With Quote
Old 4th July 2012, 03:31 PM   #24
diyAudio Member
 
formula 22's Avatar
 
Join Date: Sep 2011
Location: El Triunfo
Guys, where is the schematic (circuit) of this preamplifiers?
Thank you
  Reply With Quote
Old 4th July 2012, 04:37 PM   #25
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Quote:
Originally Posted by KatieandDad View Post
The B1 is pretty forgiving with its PSU.

I run mine from a 30VA 9-0-9V into a stock 1A bridge then CRC with 2 x 4700uF LCR caps with 2R2 between them. Reg is a straightforward LM317.

Its actually better than a DCB1 that I am trial building at the moment. I did use Obbligato 10uF Caps though.

The little PCB on the top left is just a Mains Filter that I pinched straight out of a VCR.

The PCB is Home-Brew. Although it is Double Sided there are no tracks on the Upper Surface, just the Ground Plane.
Ever so easy to make at home.
My B1 has evolved with a Salas Shunt Reg.
Attached Images
File Type: jpg DSIR9373.JPG (183.3 KB, 1084 views)
  Reply With Quote
Old 4th July 2012, 04:43 PM   #26
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Quote:
Originally Posted by formula 22 View Post
Guys, where is the schematic (circuit) of this preamplifiers?
Here is a link to the article -- http://www.passdiy.com/pdf/B1%20Buffer%20Preamp.pdf
  Reply With Quote
Old 4th July 2012, 04:48 PM   #27
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
If you wonder where the Salas Shunt Reg PCB came from, it's Home Brew. After talking to Salas he graciously let me use the original artwork for the Mesmorise which I cut off the B1 portion. For some reason my H.B. DCB1 wasn't at all reliable, probably down to a track shorting somewhere. I eventually kept the PSU part and reverted back to my H.B. Pass B1 with the huge Obligattos. Result is pure Nirvana.
Attached Images
File Type: jpg DSIR9371.JPG (197.9 KB, 1073 views)
  Reply With Quote
Old 13th July 2012, 03:23 AM   #28
PKI is offline PKI  United States
diyAudio Member
 
PKI's Avatar
 
Join Date: Aug 2011
I've changed 10uf capacitors in my B1: ClarityCap ESA --> WIMA MKP4 250v. I can tell that they are quite good. Very neutral, very! They really sound good! They are cheap (can be found at $15 pair shipped) and fits perfectly, leading spacing exactly as on the PCB. So, if you do not to spend much on Audio caps -- these are highly recommended.
  Reply With Quote
Old 12th October 2012, 11:09 AM   #29
diyAudio Member
 
JRKO's Avatar
 
Join Date: Dec 2003
Location: U.K.
Send a message via AIM to JRKO
Thanks for the build process 6L6. I have a couple of questions thou

I have the same switch as rabaird, a 6-way 2-pole from HifiCollective.

As I understand it the B1 has 2 inputs. I need to use all 6 on the switch. Do I wire all the inputs to the switch and use only one of the B1 boards inputs to receive the 6 switched inputs?

Also is it possible to have get 2 outputs from the B1 by wiring to both the boards inputs? Would help with bi-amping

Many thanks
__________________
In the interests of full disclosure JRKO = James Rupert Kingsley Osborne. And yes, my parents will pay for it when I choose their retirement home
  Reply With Quote
Old 12th October 2012, 04:37 PM   #30
diyAudio Member
 
Join Date: Nov 2004
Location: Canary Islands
Default PSU

Quote:
Originally Posted by 6L6 View Post
Audio circuit schematic is in this article - http://passdiy.com/pdf/B1%20Buffer%20Preamp.pdf

Audio board for sale here -- DIY Order Form

PSU circuit board - Universal Power supply PCB from Peter Daniel DIY Chip Amplifier Kits, PCB's, Components and Information. This product is not on his website, but email him and he takes care of it quickly. Lots more info on this board here - Universal Power Supply PCB

PSU regulator Schematic - http://cache.national.com/ds/LM/LM117.pdf
Hello guys.
I´m thinking built the B1 too.
Is this the PSU? I can´t open the file.
Have it enough filtering?
Best regards
Jose
Attached Images
File Type: jpg PSU b1.jpg (47.5 KB, 868 views)
  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
B1 builders thread Bas Horneman Pass Labs 696 14th July 2014 12:57 PM
Help diagnosing B1 Build (newbie) dasfreak Pass Labs 4 30th November 2010 01:56 AM
help with b1 + gainclone build crappyjones123 Pass Labs 4 25th June 2009 09:56 PM
B1 Preamp - Help Me! Professor smith Pass Labs 173 21st October 2008 03:55 PM


New To Site? Need Help?

All times are GMT. The time now is 11:08 PM.


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