Bosoz with tube amp? - 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 24th October 2003, 03:33 PM   #11
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
In this case the tube differential has the primary on both sides as loads the secondaries are connected in whatever fashion, series or parallel I don't know what's best in terms of impedance, to feed the input of the tube amp. 10 mA lundahl may not be enough bias current but you get the idea...
The link shows the exact opposite of what you're trying to do:

It has a single anode follower with the IS xformer functioning as a plate load and phase splitter to drive the PP FET output.

You can use the LL1660 in a number of ways; when you have balanced input on the primary side and you want to convert to SE at the secondary just ground the signal polarity that you don't want to use.

The secondary impedance will vary according to how it is hooked up but the xformer's datasheet should show you how.

Cheers,
__________________
Frank
  Reply With Quote
Old 24th October 2003, 07:27 PM   #12
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Sorry, I was in a hurry Frank, did I confuse you?
The point is to have two primaries as differential loads to get all the advantages of the balanced pair and turn that into a SE on the secondary for the tube amp. That way there is no need for output caps either.
  Reply With Quote
Old 24th October 2003, 07:46 PM   #13
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
Sorry, I was in a hurry Frank, did I confuse you?
Indeed, you did...

Do I read you correctly when I suggest you'd need two xformers, one for each signal polarity?

On the secondary side you'd then summ two identical polarities and ground the opposite one.

The tube amp in question would be a SE one I assume...

Cheers,
__________________
Frank
  Reply With Quote
Old 24th October 2003, 10:37 PM   #14
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Ok here is what I am talking about:

connect B and D get the sum of the signals from A and C?
Attached Images
File Type: jpg tube_bosoz.jpg (13.2 KB, 373 views)
  Reply With Quote
Old 24th October 2003, 11:51 PM   #15
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
connect B and D get the sum of the signals from A and C?
Yes, that's how I imagined it too although I've never seen that done before...

Cheers,
__________________
Frank
  Reply With Quote
Old 25th October 2003, 01:45 AM   #16
diyAudio Member
 
HeadSh0T's Avatar
 
Join Date: Sep 2002
Location: Toronto, Canada
hey guys thanks for all the responses.. i didn't mean to open a can of worms but is having a balanced signal worth going through such trouble?
  Reply With Quote
Old 25th October 2003, 01:47 AM   #17
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
i didn't mean to open a can of worms but is having a balanced signal worth going through such trouble?
Not to me unless for the right reasons which I can't seem to find in this case.

Cheers,
__________________
Frank
  Reply With Quote
Old 25th October 2003, 02:51 AM   #18
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Headshot,
actually thank you for bringing up the subject, I have been toying with the idea of a tube BOSOZ for a while.
I wish some of our illustrious members would pitch in a little more to come up with some suggestions.

Frank,
I am currently using a balanced system all the way from dac to speakers and it keeps amazing me, huge dynamics, imaging and total silence between the notes. Not only I think it's worth it, I don't understand how an audiophile of your caliber is doing without it.
I would want to continue from the balanced tube preamp to the balanced input of the amp. In the specific case of the coupling to the AlephX I could probably get rid of the input caps that have brought me some problem.
  Reply With Quote
Old 25th October 2003, 03:44 AM   #19
diyAudio Member
 
HeadSh0T's Avatar
 
Join Date: Sep 2002
Location: Toronto, Canada
Quote:
I am currently using a balanced system all the way from dac to speakers and it keeps amazing me, huge dynamics, imaging and total silence between the notes.
Huge dynamics and imaging are what tube-o-philes are raving about already and they're probably all non-balanced topologies.

So getting excellent audio seems to be possible whether balanced or unbalanced.
  Reply With Quote
Old 25th October 2003, 10:22 AM   #20
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
Frank,
I am currently using a balanced system all the way from dac to speakers and it keeps amazing me, huge dynamics, imaging and total silence between the notes.
In your case it's worth pursuing since you have a balanced source already.

Quote:
Not only I think it's worth it, I don't understand how an audiophile of your caliber is doing without it.
I'm considering it but it would require a complete rebuild of almost all the electronic stages I currently use; MC headamp, preamp and power monoblocks....
Not exactly a cheap adventure and I have this nagging feeling it won't be worth the extra expenditure.

Cheers,
__________________
Frank
  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
To BOSOZ or not to BOSOZ... please comment. spence Pass Labs 4 27th February 2012 02:57 AM
Poll! What do you use in your X-BOSOZ or BOSOZ for Volume Control and Input Selector? promitheus Pass Labs 87 19th February 2006 03:15 PM
X-bosoz vs. CCS X-bosoz, how does the sound compare? acliao Pass Labs 14 26th February 2004 12:55 AM
BOSOZ 2 tube power Charles BL Pass Labs 9 14th January 2003 11:20 AM
Is this just another BOSOZ? protos Pass Labs 16 9th January 2003 01:19 PM


New To Site? Need Help?

All times are GMT. The time now is 05:58 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