B1 builders 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 13th November 2009, 02:41 PM   #21
diyAudio Member
 
vitalstates's Avatar
 
Join Date: Jan 2006
Location: uk
heres the link cos I'm not sure how to get more than one big photo on a post...

Vitalstates- Amplifiers


Ed
__________________
There is nowhere you can be that isn't where you're meant to be
www.vitalstates.org
  Reply With Quote
Old 23rd November 2009, 09:55 PM   #22
diyAudio Member
 
jonsmith's Avatar
 
Join Date: Jan 2009
Location: Cincinnati, Ohio
Default Here's My B1, 1st DIY

Hi to one and all, with special thanks to Mr. Pass:

A couple of photos of my B1. Finished it last Thus./Friday and have been listening pretty much constantly since.

Note the "fabricated from billet magnesium knobs" and the hickory case made from a tree that fell in my father-in-law's woods 25 years ago.

Am hearing things I've never heard before, and some things that used to be prominent are farther back in the mix than before. Bass is clearer, not as resonant. High end is much softer and more like I remember records sounding like.

Note that I am powering a GFA 555 amp that I bought in 1986... It sounds a lot more linear at both lower and higher volumes--less "confused." Would have never been able to afford a new preamp, so this was really a great treat to get such an improvement for little or no money! Thanks for your generosity Mr. Pass, I have really enjoyed my Adcom gear that you designed, and now I can afford some of your other stuff (if I build it myself!)

Jonathan Smith
Attached Images
File Type: jpg DSC_0562.jpg (976.3 KB, 2165 views)

Last edited by jonsmith; 23rd November 2009 at 09:59 PM. Reason: want to add second photo with top open
  Reply With Quote
Old 23rd November 2009, 10:13 PM   #23
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
We aim to please.

  Reply With Quote
Old 24th November 2009, 04:59 PM   #24
Beftus is offline Beftus  Netherlands
diyAudio Member
 
Beftus's Avatar
 
Join Date: Nov 2008
Location: Netherlands
... and all that audio nirvana is powered by just two 9 volts PP3 batteries? Must get me some of those!
  Reply With Quote
Old 25th November 2009, 12:47 PM   #25
diyAudio Member
 
jonsmith's Avatar
 
Join Date: Jan 2009
Location: Cincinnati, Ohio
Default Batteries...

The clerk at Radio Shack _did_assure me that the batteries were audiophile grade.

The preamp is now sporting a brand new hewlett packard regulated 20 V power supply from Wal Mart, currently on sale.

I think it sounds just as good, and particularly better than when the circuit is running on 6 volts, like when your audophile batteries are giving up the ghost.
  Reply With Quote
Old 25th November 2009, 01:32 PM   #26
hates ground loops
diyAudio Member
 
Rodeodave's Avatar
 
Join Date: Dec 2004
Location: in the alps
Blog Entries: 1
Here's my take on the B1. It will be the input-buffer of an integrated amp I'm building for a friend of mine. I somehow like to p2p and make connections with the components' leads. Half the solder joints.

Today I'll add the resistors. Cute amp.

Edit: In the hand-drawn schematic half the caps (Panasonic FC 2200uF50V) have wrong polarity, yes. I was used to draw bipolar supplies, so...
But they were installed correctly as you can see in the pic.
Attached Images
File Type: jpg b1_p2p.jpg (571.7 KB, 1938 views)
File Type: jpg b1_front.jpg (441.4 KB, 1774 views)
File Type: jpg b1_bottom.jpg (611.6 KB, 1672 views)
__________________
Gravity - Making the G since 13.7 billion B.C.

Last edited by Rodeodave; 25th November 2009 at 01:44 PM.
  Reply With Quote
Old 25th November 2009, 01:38 PM   #27
hates ground loops
diyAudio Member
 
Rodeodave's Avatar
 
Join Date: Dec 2004
Location: in the alps
Blog Entries: 1
And here's the data from matching the 100 2SK170BL.
First histo shows I_dss abundance with bins 0.04mA wide.
Second shows same with bins 0.01mA wide.
Third pic shows data.

The JFETS used have (7.68,7.68,7.67,7.66)mA I_dss.

Edit: I ended up with 26 unmatched JFETs, the others are matched within 0.01mA up to 0.04mA, so 37 pairs in total.
Attached Images
File Type: png 2sk170bl_04bins.png (37.4 KB, 1506 views)
File Type: png 2sk170bl_01bins.png (20.1 KB, 212 views)
File Type: jpg 2sk170bl_matching.jpg (715.6 KB, 247 views)
__________________
Gravity - Making the G since 13.7 billion B.C.

Last edited by Rodeodave; 25th November 2009 at 01:48 PM.
  Reply With Quote
Old 14th December 2009, 10:01 PM   #28
hates ground loops
diyAudio Member
 
Rodeodave's Avatar
 
Join Date: Dec 2004
Location: in the alps
Blog Entries: 1
My B1 is finished, probably. But as Papa once said:

"check everything twice, (once in the evening, once in the morning)"
(Zen Variations #8, page 8)

I'll sleep over it and fire it up tomorrow.
Attached Images
File Type: jpg b1_top_angle.jpg (431.1 KB, 607 views)
File Type: jpg b1_bottom_angle.jpg (710.8 KB, 574 views)
File Type: jpg b1_half.jpg (731.2 KB, 350 views)
__________________
Gravity - Making the G since 13.7 billion B.C.
  Reply With Quote
Old 14th December 2009, 10:58 PM   #29
jleaman is offline jleaman  Belgium
Banned
 
Join Date: Apr 2002
Send a message via AIM to jleaman
good work guys, looking good
  Reply With Quote
Old 24th December 2009, 05:15 AM   #30
studeb is offline studeb  United States
diyAudio Member
 
studeb's Avatar
 
Join Date: Feb 2008
Location: San Diego
Here is my build.
Been running for a few months now, I do enjoy it very much.
The PS is a regulated 18V wall wart. PassDiy board and pretty much stock parts.
Thank you Mr. Pass and associates that are leased/rented or otherwise indebtured.
The downside is that now i need a new phono amp.......
Attached Images
File Type: jpg Small DIY1.JPG (31.4 KB, 517 views)
File Type: jpg Small DIY2.JPG (59.0 KB, 1066 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
F3 Builders Thread Melon Head Pass Labs 523 31st May 2014 03:05 PM
ezDAC v.1.5 Builders Thread ezkcdude Digital Line Level 366 14th March 2013 03:31 PM
A-X IP Issues (split from Builders thread) tomchaoda Pass Labs 107 16th October 2011 02:05 AM
one for the box builders offroadbum Car Audio 2 11th October 2004 09:19 PM


New To Site? Need Help?

All times are GMT. The time now is 04:07 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