DAC -> Amp with parallelled E182CC and Lundahl transformers -> 8ohm headphones - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 26th November 2009, 11:37 AM   #11
Stixx is offline Stixx  Germany
I am
diyAudio Member
 
Stixx's Avatar
 
Join Date: Sep 2003
Location: Southern Germany
The simpistic Salas' HV shunt is highly reciommended...
I built two on veroboard, they work like a charm and sound excellent (Aikido headphone amp).
  Reply With Quote
Old 26th November 2009, 02:35 PM   #12
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
well I have one question, why not keep it balanced the whole way?? if your doing all this, you should be able to whack a balanced cable on the UE-10?? I certainly know that my JH13 sound far superior to even their normal uber self when run balanced out of my Buffalo32. you can even buy small differential connectors from neutrik or or ODU (available in male and female/inline and chassis mount) that will allow you to use them balanced at home and use a small and light adapter to run single ended when portable. i'm quite interested in your results actually. I have been playing with the idea of a tube stage in my acko dac build. i'm using twisted pear and sjorstromaudio regs, some nice iron and i'm torn between a straight transformer coupled output, a tube buffer with transformer output; or the new D1B1 balanced buffer to partner with the dac. the idea being to drive the JH13 directly as one option, and the ability to also drive my active monitors; perhaps through a different buffer stage switched via relay, or the second signal pulled from a different point in the circuit if necessary

Last edited by qusp; 26th November 2009 at 02:40 PM.
  Reply With Quote
Old 26th November 2009, 02:36 PM   #13
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
and yes keep the regs as close as possible to the components they are regulating, especially digital components.
  Reply With Quote
Old 26th November 2009, 02:55 PM   #14
Bertel is offline Bertel  Germany
diyAudio Member
 
Join Date: May 2009
Well, I will follow the balanced-all-the way-through path in my alternative solid state approach - ZAPfilter MK2 when it comes out in Jan and then some kind of diamond buffer or so, don't know yet.

This approach here is kind of the other extreme, a serious implementation with transformers and tubes, I love that too, and I feel this fits me better single-ended ;-)

BTW: You mention
Quote:
small differential connectors from neutrik or or ODU (available in male and female/inline and chassis mount)
- these are for the output stage / chassis and not for the phones, right? Because this little pain has stopped me yet from already trying the UEs balanced - couldn't find those tiny connector pins...

And: I had missed the D1B1 - now that sounds interesting, probably will have to give that a try too ;-) Thanks for pointing me to it!

Last edited by Bertel; 26th November 2009 at 02:59 PM.
  Reply With Quote
Old 26th November 2009, 03:19 PM   #15
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by Bertel View Post
Well, I will follow the balanced-all-the way-through path in my alternative solid state approach - ZAPfilter MK2 when it comes out in Jan and then some kind of diamond buffer or so, don't know yet.
yeah i'll probably end up playing with some of the tiny little smd diamond buffers I picked up from pers as well (SSB01) thats the alternative; transformer direct to the power monitors and buffered to the IEMs

Quote:
This approach here is kind of the other extreme, a serious implementation with transformers and tubes, I love that too, and I feel this fits me better single-ended ;-)
sure, whatever floats you boat, it takes some serious dedication to run them balanced, but it doesnt have to be as painful as many think, the lundahs I have in mind will spin bal and SE, as will the buffers

Quote:
BTW: You mention - these are for the output stage / chassis and not for the phones, right? Because this little pain has stopped me yet from already trying the UEs balanced - couldn't find those tiny connector pins...
yes those are for the chassis and termination at the end of the cable, the IEM connectors you only have 2 options for DIY, reterminate a stock cable with the connectors and put a matching female on the chassis, or make the IEM connectors yourself as I have with plastic molding and sterling silver pins you cannot buy the connectors, you must solder the pins on and add the molding to the finished cable with memory wire, which as it happens its pure silver as well, twas the only suitable gauge wire I had on hand, nothing fancy, just soft annealed german silver, only 60c a foot or something .

Quote:
And: I had missed the D1B1 - now that sounds interesting, probably will have to give that a try too ;-) Thanks for pointing me to it!
are you doing the ackodac as well?? yeah the D1B1 is in the lead at the monent, but there is something full-on but at the same time elegant about a transformer coupled/tube buffered output dac.
  Reply With Quote
Old 26th November 2009, 03:50 PM   #16
Bertel is offline Bertel  Germany
diyAudio Member
 
Join Date: May 2009
Quote:
or make the IEM connectors yourself
Hmm, that's probably what I'll have to do as well.. Let's see - single ended transformer-tube-combo first, stil enough work needed here to finalize the design

Quote:
there is something full-on but at the same time elegant about a transformer coupled/tube buffered output dac
That's exactly what floats my boat with this here

Quote:
are you doing the ackodac as well??
No, I have two Buffalo32s already (one not working properly, thus for testing mods ), waiting for the reworked new version to become available which will be fully tweakable, including all registers and firmware accessible Besides that, I'm currently kind of on a reverse path - have to implement all of others finest and greatest: Wolfson WM8741 in the works, BB PCM1794A to follow, then aybe the AD1955, but also two NOS DACs, namely TDA1541A and PCM1704, or maybe rather the TDA1543 - *sigh* this winter will be tough...
  Reply With Quote
Old 27th November 2009, 08:06 AM   #17
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by Bertel View Post
Hmm, that's probably what I'll have to do as well.. Let's see - single ended transformer-tube-combo first, stil enough work needed here to finalize the design
well if you are confident making your own cable, you can send it here and i'll terminate it for you if you like. perhaps best via PM

Quote:
That's exactly what floats my boat with this here
ditto, thus the reason I was quite interested to see what was in this thread

Quote:
No, I have two Buffalo32s already (one not working properly, thus for testing mods ), waiting for the reworked new version to become available which will be fully tweakable, including all registers and firmware accessible Besides that, I'm currently kind of on a reverse path - have to implement all of others finest and greatest: Wolfson WM8741 in the works, BB PCM1794A to follow, then aybe the AD1955, but also two NOS DACs, namely TDA1541A and PCM1704, or maybe rather the TDA1543 - *sigh* this winter will be tough...
errm.. you do realize that the ackodac is a sabre dac based on the same chips as the buffalo32?? I have a buffalo32 as well (includiong both types of power supply), but I grew tired of waiting for the TP guys to release the tweakers board; plus the ackodac has all the things the next generation of the buff is going for, well all bar the fully developed micro (under development), which will be finished well before the next incarnation of the buffalo. It has all the ins and outs exposed on pads ready for molex or pin headers; along with all the regulation points with pads directly next to the components that are to be regulated. the BOM uses higher speced parts (COG instead of X7R and decoupling with organic polymer caps; its also about half the price including all parts. (just dac board, not regs or PSU or I/V). plus the D1B1 is to be released in a form that is specifically designed to stack directly on top of it, or something like you mention could easily be substituted. funny though, i've been doing something similar for kicks whike I wait, right down to the TDA1541A dac not doing a PCM1704 or AD1955 though. PM me if you want more details.

so I reckon you should get on board, theres no reason to hang around waiting for the TP guys to release it and you'll save youreslf some time and money in the process. BTW I have no affiliation with Acko bar being involved in the shaping of it via feedback and I might be trying my hand at developing a transformer based output module to round out the compliment of options.

Last edited by qusp; 27th November 2009 at 08:11 AM.
  Reply With Quote
Old 27th November 2009, 08:26 AM   #18
Bertel is offline Bertel  Germany
diyAudio Member
 
Join Date: May 2009
Default acko DAC

Quote:
you do realize that the ackodac is a sabre dac based on the same chips as the buffalo32?? I have a buffalo32 as well (including both types of power supply), but I grew tired of waiting for the TP guys to release the tweakers board; plus the ackodac has all the things the next generation of the buff is going for, well all bar the fully developed micro (under development), which will be finished well before the next incarnation of the buffalo. It has all the ins and outs exposed on pads ready for molex or pin headers; along with all the regulation points with pads directly next to the components that are to be regulated. the BOM uses higher speced parts (COG instead of X7R and decoupling with organic polymer caps; its also about half the price including all parts. (just dac board, not regs or PSU or I/V).
I DID realize that the acko DAC is based on the ESS90XX, but I DID NOT realize that it seems to be designed the way I'm looking for: I hate the 'integrated' nature of the current Buffalo32 version but instead build e.g. my current Wolfson WM8741 based DAC with as little around the chip as possible (currently on its board there's only six caps, plus the regulators as close as possible, plus a few components aside to tap into the software options, but nothing in the signal path from the chip to the transformer). I will have a thorough look at the acko DAC concept if this is similar (or if I can adjust it accordingly), and yes the micro is important too.

If this all is the case - yes, then you definitely have me on board I'll PM you.
  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
Lundahl LL1620 output transformers NEW a333bt Swap Meet 2 25th April 2013 03:43 PM
'Best' amp concept for headphones w/ impedance ~8ohm Bertel Solid State 8 19th November 2009 10:30 AM
Where can i get Lundahl transformers? yangsmm Parts 3 13th June 2008 03:00 AM
FS: Lundahl output transformers LL1517 dhole Swap Meet 0 16th April 2008 09:28 AM
Lundahl Signal Transformers! bequerel Swap Meet 6 13th June 2005 04:20 PM


New To Site? Need Help?

All times are GMT. The time now is 09:22 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