Building a symmetrical psu B1 buffer - Page 259 - 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 30th December 2012, 09:09 PM   #2581
diyAudio Member
 
Join Date: Mar 2007
Are you sure the electrolyts is mounted correct ?
  Reply With Quote
Old 31st December 2012, 01:26 PM   #2582
ncc is offline ncc
diyAudio Member
 
Join Date: Jul 2006
Location: VN
Send a message via Yahoo to ncc
Quote:
Originally Posted by Erlend Sæterdal View Post
Are you sure the electrolyts is mounted correct ?
Yes, I've checked again and all electrolytics are mounted correctly
  Reply With Quote
Old 6th February 2013, 12:56 AM   #2583
diyAudio Member
 
noSmoking's Avatar
 
Join Date: May 2010
Location: Texas
hi ncc,
I checked google for bc517 and it's a high Hfe darlington,I am not sure bc550 will do it ,might try MPSW45A and 2N6426 are similar to BC517, both are good.Pinout is different.
Regards,
NS
  Reply With Quote
Old 6th February 2013, 01:26 AM   #2584
diyAudio Member
 
noSmoking's Avatar
 
Join Date: May 2010
Location: Texas
Hi Salas,
My Mezmerize is working great ! It went right together and played fine ,Sounds Great!
THANKS!
NS
  Reply With Quote
Old 6th February 2013, 02:24 AM   #2585
diyAudio Member
 
Join Date: Mar 2007
MPSA 13 ?
  Reply With Quote
Old 6th February 2013, 04:16 AM   #2586
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Sounds like a candidate. Should reverse its orientation and check that the 7812 is good.
  Reply With Quote
Old 6th February 2013, 04:31 AM   #2587
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by noSmoking View Post
Hi Salas,
My Mezmerize is working great ! It went right together and played fine ,Sounds Great!
THANKS!
NS
That layout is vintage of what later sprung to Mez and Hypno in their popular forms. Nice to see it done again and playing well. Watch turn off cycle mainly if to ever drive a DC coupled amp since there is no relay. Enjoy.
  Reply With Quote
Old 25th February 2013, 04:55 PM   #2588
diyAudio Member
 
Join Date: May 2005
Location: HK
Hello there,

These is my questions :

1) Can anyone know how to arrange my B1 buffer + Shunt type attenuator + tube pre-amp order for the best deliver the source from CD player or Phono ?

2) What is the optimal value of the signal in series resistor for the shunt attenuator with B1 buffer interpose ?

Thanks for your answer in advance
Attached Images
File Type: jpg IMAG0026.jpg (473.5 KB, 503 views)
  Reply With Quote
Old 26th February 2013, 10:50 AM   #2589
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
The B1 has two switchable inputs. That's where the two sources connect.
Then the switches should feed the selected signal to the attenuator.
Finally the output of the attenuator is fed to the buffer since the attenuator cannot alone drive the cables to the power amplifier and/or the pre-amp.

Do you really need a pre-amp?
Which signal needs more amplification?
Do that before you send the signal to the attenuator.
__________________
regards Andrew T.
  Reply With Quote
Old 28th February 2013, 06:04 AM   #2590
diyAudio Member
 
Join Date: May 2005
Location: HK
Hello Andrew,

Tube preamp was my DIY project finished in few years ago but last year I added B1 buffer on it. All the sound and presentation is slightly better than before. Right now I am replacing my Preamp's 24 steps attenuator by shunt type attenuator (with remote control and has 80 steps). Actually, I want the phono signal can get a better presentation.

My concern is the order arrangement for the shunt type attenuator and B1 buffer. You know the shunt type attenuator drawback is vary of impedance to its next stage. Base on my situation, how following option is better deployment ?

Option 1) Source signal -> Shunt type attenuator -> B1 buffer -> Tube Preamp
Option 2) Source signal -> B1 buffer -> Shunt type attenuator -> Tube Preamp

Another question is how to selection the value of series resistor inside the attenuator ?
  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
New-building of my B1 buffer Babowana Pass Labs 328 20th February 2010 02:14 AM


New To Site? Need Help?

All times are GMT. The time now is 08:30 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