Glassware Unbalancer as I/V stage - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

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 27th August 2014, 11:00 AM   #1
diyAudio Member
 
Join Date: Sep 2013
Default Glassware Unbalancer as I/V stage

Hello to everyone,
i would like to build an Unbalancer from Glassware Audio Design to use as I/V stage for a Buffalo III DAC, but I'm really stuck as i'm a newbie in tubes circuits and i can't understand Glassware's site infos about that product (i.e. components included in the kit, what else i need to build it, what PS and transformers should i use, etc...). Unfortunately i can't get any answer from Glassware Audio Design: their email address seems dead...
I see there was a thread on this subject in this forum, but it has been removed, i don't know exactly why.
Could someone please provide me the infos i need to carry on this project (even on PM)? Has someone built an Unbalancer for Buffalo III yet that could help me?
Many thanks in advance!

Last edited by Luca72c; 27th August 2014 at 11:34 AM.
  Reply With Quote
Old 27th August 2014, 01:43 PM   #2
diyAudio Member
 
Join Date: Jul 2005
Quote:
Originally Posted by Luca72c View Post
Hello to everyone,
i would like to build an Unbalancer from Glassware Audio Design to use as I/V stage for a Buffalo III DAC, but I'm really stuck as i'm a newbie in tubes circuits and i can't understand Glassware's site infos about that product (i.e. components included in the kit, what else i need to build it, what PS and transformers should i use, etc...). Unfortunately i can't get any answer from Glassware Audio Design: their email address seems dead...
I see there was a thread on this subject in this forum, but it has been removed, i don't know exactly why.
Could someone please provide me the infos i need to carry on this project (even on PM)? Has someone built an Unbalancer for Buffalo III yet that could help me?
Many thanks in advance!
Blitz started this thread which should be relevant:

BIII with Broskie Unbalancer vs. EE Minimax Plus - My experience

There is a manual for this circuit which you should read thoroughly. I've tried to attached it in case you haven't seen it, but it's just slightly over the size limit to attach.

So check here: http://tubecad.com/2011/11/25/Unbala...er%209-pin.pdf

You will need DC power supply of around 240V.

You need to choose your I/V resistor values and there is a choice of tubes you can use. The manual provides the component values to use depending on the tubes you select. Select a combination of I/V resistor and tube type according to the gain you need for your required output for your amplification/speakers.

There is another document where Broskie shows this application for I/V converter use. See here: The Unbalancer
  Reply With Quote
Old 27th August 2014, 02:32 PM   #3
diyAudio Member
 
Join Date: Sep 2013
Quote:
Originally Posted by Bud Barnez View Post
Blitz started this thread which should be relevant:

BIII with Broskie Unbalancer vs. EE Minimax Plus - My experience

There is a manual for this circuit which you should read thoroughly. I've tried to attached it in case you haven't seen it, but it's just slightly over the size limit to attach.

So check here: http://tubecad.com/2011/11/25/Unbala...er%209-pin.pdf

You will need DC power supply of around 240V.

You need to choose your I/V resistor values and there is a choice of tubes you can use. The manual provides the component values to use depending on the tubes you select. Select a combination of I/V resistor and tube type according to the gain you need for your required output for your amplification/speakers.

There is another document where Broskie shows this application for I/V converter use. See here: The Unbalancer
Thank you very much! In facts i didn't see that manual... I've problems with Glassware's site, i can't find much...
Anyway, it seems to me that manual refers to older versions of Unbalancer, that had PSs on board, instead newer version needs external PSs. Am i wrong?
What glassware PSUs can i use for newer versions of Unbalancer? And what R12 resistor (or what else) should i use in accord to that PSU specifications?
  Reply With Quote
Old 27th August 2014, 07:55 PM   #4
diyAudio Member
 
Join Date: Jul 2005
Quote:
Originally Posted by Luca72c View Post
Thank you very much! In facts i didn't see that manual... I've problems with Glassware's site, i can't find much...
Anyway, it seems to me that manual refers to older versions of Unbalancer, that had PSs on board, instead newer version needs external PSs. Am i wrong?
What glassware PSUs can i use for newer versions of Unbalancer? And what R12 resistor (or what else) should i use in accord to that PSU specifications?
There a few options for the power supply. This looks like it would work for you: PS-15 High-Voltage Power Supply & Two Low-Voltage Regulated Power Supplies

You will need power for B+ (high voltage, 240V in this case) and a low voltage for your heaters (6.3V or 12.6V depending on tubes you use).

The PCB linked above provides both the high voltage and low voltage on one PCB, so it's quite convenient. You could use separate PCBs, one for B+ and another different supply for heaters. It's up to you and how you wish to implement and where it will ultimately fit - often determined by chassis size. You also need to think if there's anything else you want to power inside the case.

Glassware's power supplies:

PS-1 - Both B+ and heaters
PS-5 - Only B+ (tube based)
PS-7 - Only B+
PS-15 - Both B+ and heaters (x2)
PS-14 - Both B+ and heater (x1) cheaper than PS-15
Janus shunt regulator - both B+ and heaters

I used a tube regulated power supply PCB and made the unballancer point to point without a PCB. It will be easier to use PCBs for both.

If you want a Glassware power supply, to me the PS-1 or PS-15 look to be best for your needs. The Janus shunt could work well too. But I'm no expert and never built any of them either. If I had to recommend one then still the PS-15 as it's in stock. Someone else may advise you better than me.

...you then just need a suitable transformer or two.

Select R12 once you know how much current each HV channel will consume and when you know the power supply voltage you will achieve. R12 is used to achieve the correct voltage for B+. So your raw B+ supply can be higher than your ultimate aim for 240V. You use the R12 to bring voltage down to 240V from whatever your power supply gives raw. You can build your power supply first, then select R12 to provide ultimate desired voltage.

[see page 15 on manual].

Last edited by Bud Barnez; 27th August 2014 at 08:12 PM. Reason: To add R12
  Reply With Quote
Old 27th August 2014, 08:15 PM   #5
diyAudio Member
 
Join Date: Sep 2013
Quote:
Originally Posted by Bud Barnez View Post
There a few options for the power supply. This looks like it would work for you: PS-15 High-Voltage Power Supply & Two Low-Voltage Regulated Power Supplies

You will need power for B+ (high voltage, 240V in this case) and a low voltage for your heaters (6.3V or 12.6V depending on tubes you use).

The PCB linked above provides both the high voltage and low voltage on one PCB, so it's quite convenient. You could use separate PCBs, one for B+ and another different supply for heaters. It's up to you and how you wish to implement and where it will ultimately fit - often determined by chassis size. You also need to think if there's anything else you want to power inside the case.

Glassware's power supplies:

PS-1 - Both B+ and heaters
PS-5 - Only B+ (tube based)
PS-7 - Only B+
PS-15 - Both B+ and heaters (x2)
PS-14 - Both B+ and heater (x1) cheaper than PS-15
Janus shunt regulator - both B+ and heaters

I used a tube regulated power supply PCB and made the unballancer point to point without a PCB. It will be easier to use PCBs for both.

If you want a Glassware power supply, to me the PS-1 or PS-15 look to be best for your needs. The Janus shunt could work well too. But I'm no expert and never built any of them either. If I had to recommend one then still the PS-15 as it's in stock. Someone else may advise you better than me.

...you then just need a suitable transformer or two.

Select R12 once you know how much current each HV channel will consume and when you know the power supply voltage you will achieve. R12 is used to achieve the correct voltage for B+. So your raw B+ supply can be higher than your ultimate aim for 240V. You use the R12 to bring voltage down to 240V from whatever your power supply gives raw. You can build your power supply first, then select R12 to provide ultimate desired voltage.

[see page 15 on manual].
Thank you very much again, your informations are very useful!
  Reply With Quote
Old 27th August 2014, 08:46 PM   #6
jama is offline jama  Spain
diyAudio Member
 
Join Date: Jun 2004
Location: Cartagena, Murcia
I did it. Wonderful results. I used pcb from glassware. And i used as you says, connect to B3. Try it. You will love it. Until next week I can not do any photo.
  Reply With Quote
Old 27th August 2014, 08:48 PM   #7
jama is offline jama  Spain
diyAudio Member
 
Join Date: Jun 2004
Location: Cartagena, Murcia
I am using 6cg7 for input tubes and 6n6p as output tube. And 50 ohm to iv converter
  Reply With Quote
Old 27th August 2014, 08:52 PM   #8
diyAudio Member
 
Join Date: Sep 2013
Very good! Thanks to you too!
And what coupling capacitors do you use? I mean models and values...

Last edited by Luca72c; 27th August 2014 at 08:56 PM.
  Reply With Quote
Old 28th August 2014, 02:03 AM   #9
diyAudio Member
 
Join Date: Sep 2013
Quote:
Originally Posted by Bud Barnez View Post
If you want a Glassware power supply, to me the PS-1 or PS-15 look to be best for your needs. The Janus shunt could work well too. But I'm no expert and never built any of them either. If I had to recommend one then still the PS-15 as it's in stock. Someone else may advise you better than me.

...you then just need a suitable transformer or two.

Select R12 once you know how much current each HV channel will consume and when you know the power supply voltage you will achieve. R12 is used to achieve the correct voltage for B+. So your raw B+ supply can be higher than your ultimate aim for 240V. You use the R12 to bring voltage down to 240V from whatever your power supply gives raw. You can build your power supply first, then select R12 to provide ultimate desired voltage.

[see page 15 on manual].
Well, please rectify my understandings.
I choose ECC802 as input and 6cg7 as output tubes. Assuming i will use a PS-15 PSU, i will need:
1) on PS-15 B+ set to 240V. Can it be set? Or the oputput is fixed to 350V (i will use 400V caps)?
2) on PS-15 Low voltage set to 1x6.3V and 1x12.6V?
3) 1 Transformer with 1 sec. 240VAC and 1 sec. 12VAC? Or i need 1x 240VAC and 2x low voltage secs (2x 12VAC or 12VAC + 6VAC)?
On Unbalancer board i will find 2 power inputs to power heaters (then use 12.6V AND 6.3V sources)? Or there is one single input, so i should connect a 12.6VDC single low voltage source to power both 12.6V and 6.3V tubes?
More: when i try to calculate R12 value, i find that the voltage drop is relative to current flow. But how can i know how much current flows? What it depends from?
Sorry, i know i'm a bit sturd about that, but as i said i'm a total newbie in tubes circuits... but i try to understand better

Last edited by Luca72c; 28th August 2014 at 02:08 AM.
  Reply With Quote
Old 28th August 2014, 05:12 AM   #10
jama is offline jama  Spain
diyAudio Member
 
Join Date: Jun 2004
Location: Cartagena, Murcia
Hello again, I could do two photos. One with PSU and the other with B3 and unbalancer. PSU has two transformers, one with 170VAC 100mA and the other with 15VAC and 2A. I am using four hexfred diodes, one 220UF/350V, inductor of 15H and output to other box with electronics. The other transformer to low turn-on 12.6 V into filaments of four tubes (see unbalancer doc)
Attached Images
File Type: jpg 20140828_031449_resized.jpg (913.7 KB, 155 views)
File Type: jpg 20140828_031517_resized.jpg (918.0 KB, 147 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
Broskie Unbalancer Bud Barnez Tubes / Valves 7 24th August 2014 07:19 AM
NOS 1794 DDDAC, Buffalo IIIse, Unbalancer and more malarkey Swap Meet 3 20th May 2013 10:04 AM
Broskie Unbalancer - manual query? lordearl Analog Line Level 0 17th March 2012 08:00 AM
Frank's 6SN7 line stage / preamp with GlassWare PS-1? Evenharmonics Tubes / Valves 2 24th July 2011 03:20 PM
pick tubes for tubecad unbalancer nightanole Tubes / Valves 0 3rd July 2011 01:59 PM


New To Site? Need Help?

All times are GMT. The time now is 05:06 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