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Analog Squared Paper Discussion and Appreciation Thread. - Page 163

post #2431 of 3488
Wow! I do not know who's amp this one is but Shikada san has provided both single and balanced outputs on this one.. rather special!


"This is TU-05g #023 special model.
This amp able to connect 4-Pin Balance XLR Headphone, 6.3mm Unbalance and 3.5mm. Imput Jack is top of body."


*
post #2432 of 3488
Newbie question.......would this be balanced output but only single input available?

Edit. Looks very nice. Only listened to Gavin's and was very impressed.
post #2433 of 3488

spkrs01, I would be highly interested in demoing the RWAK120-S next you in London!

Quote:

Originally Posted by ianmedium View Post

Wow! I do not know who's amp this one is but Shikada san has provided both single and balanced outputs on this one.. rather special!


"This is TU-05g #023 special model.
This amp able to connect 4-Pin Balance XLR Headphone, 6.3mm Unbalance and 3.5mm. Imput Jack is top of body." Warning: Spoiler! (Click to show)

*

 

Thanks! Pretty stunning and has me very interested. Need to fire off an email...


Edited by LFC_SL - 10/13/13 at 9:58am
post #2434 of 3488
Quote:
Originally Posted by kerrys30 View Post

Newbie question.......would this be balanced output but only single input available?

Edit. Looks very nice. Only listened to Gavin's and was very impressed.


at the moment i think it's not in the pure sense of balanced output. if you directly connect the two output transformers to left and right (4 pins)

 

- L-"Ground" - Left - Right - R-"Ground" (i call one of them "Ground", in fact they are not as long as you do not connect them, i.e. output ground)

 

so if there were only the 4 pin xlr connector, current flow would be independent for left and right.

 

But there is also the 6.3mm headphone jack, so the two L-Ground and R-Ground must be connected as the 6.3 mm connector has only one ground for both channels. so the current for both channels is mixed floating through one Ground Wire, not two separated.

 

Okay, one could discuss if there is an influence of the ac current of one channel back through the output transformer to the other channel and vice versa or if this is only an academic discussion.

 

For my "big" mod (as posted before) i will provide a switch to connect or disconnect this two pins of the output transformers when using the 6.3 mm or 3.5mm headphone out.


Edited by GermanGuy - 10/13/13 at 12:30pm
post #2435 of 3488

Thank all of you for your comments of my last posts. to be honest i think

 

- i am not that bad in finding and combining existing technologies and components to solutions

 

but

 

- this is the first time i try to get used to and learn something about tubes

- also this is my first audio and especially tube project

 

so first of all

 

- i have to do a lot of measurements (voltage, current for bias, grid bias, anode voltage)

- analyse the tu-05 and draw a schematic

- rebuild the df91 and dl92 stages

- then build and test new internal power supplies (up to now i don't know if and when shikada san offers me a second internal power supply board, always too busy)

- build and test other components

- listen to the results

 

before completely separating the tu-05 left and right channel and modding the amp.

 

so a lot to learn and to do, and hopefully also resulting in some improvement for the sound (not only waisting money).

 

in general i have the following primary design goals for the tu-05:

 

Sound improvements due to

- completely separated mono design

- high end output transformers

- (eventually high end input transformers)

 

- double battery capacity for longer runtime

- extension of the output impedance for 300 Ohm - 600 ohm headphones

 

- (eventually - adjustable bias, grid bias, anode voltage to also use the DL93 tubes with twise the output power)

 

after having done this, i want to:

 

build and test more powerfull amplification stages (just for fun) with

- two or four DL92 in parallel

- DL93 .. DL98 tubes

 

But what i will definetely do is to design and build

 

- a mini tu-05 version (about two times the size of an ALO Continental V2 is possible if the output transformers are small enough) with the DF61 and DL620 subminiature tubes, but the downsizing is limited by the size of the output transformers (the smaller the output transformer, the higher the lowest frequency, limits the bass, but the lower the output power, the smaller the transformer, so let's wait and see).

 

I also have requested an offer for as small as possible output transformers specially designed for DL620 and also for the smallest sensefull size for DL92.

 

I also have installed SPICE (circuit emulation), schematic design and PCB layout software to get this project really as small as possible.

 

i want to mention that whatever i do, i will never distribute or give the schematic of the original tu-05 design to any other person including the thread members, but of course if this mini amp will ever function, it will be a pleasure for me to give all the results and pcb layouts and part lists to shikada san.


Edited by GermanGuy - 10/13/13 at 12:36pm
post #2436 of 3488
btw, here is a sketch of one of the principle designs i have in mind for my modded tu-05:

post #2437 of 3488
Quote:
Originally Posted by ianmedium View Post

Wow! I do not know who's amp this one is but Shikada san has provided both single and balanced outputs on this one.. rather special!


"This is TU-05g #023 special model.
This amp able to connect 4-Pin Balance XLR Headphone, 6.3mm Unbalance and 3.5mm. Imput Jack is top of body."
 
Warning: Spoiler! (Click to show)

*

 

 

 

Guilty as charged...! :D

 

Here's couple more pictures from Shikada San for his beautiful craftsmanship.

 

 

 


Edited by Boringer - 10/13/13 at 10:36pm
post #2438 of 3488
Quote:
Originally Posted by GermanGuy View Post
 
Quote:
Originally Posted by kerrys30 View Post

Newbie question.......would this be balanced output but only single input available?

Edit. Looks very nice. Only listened to Gavin's and was very impressed.


at the moment i think it's not in the pure sense of balanced output. 

 

 

 

GG's right, the 4-pin XLR in this case is not a balance output.

 

So for the total 3 output options (the 1/4", 1/8' and XLR) are all unbalanced.


Edited by Boringer - 10/13/13 at 10:28pm
post #2439 of 3488
Boringer, its yours!!! Congratulations, now I am really looking forward to hearing what you think of it. Can I ask why the XLR if it is not balanced? The combination of blue and white LED's is stunning!

It looks like you have Mil-spec Sylvania's for the 1T4 stage and Mil-spec Raytheons for the 3S4 stage. I have that combination in reverse and I think you will enjoy the stock tubes greatly!
Edited by ianmedium - 10/13/13 at 10:24pm
post #2440 of 3488
Quote:
Originally Posted by ianmedium View Post

Boringer, its yours!!! Congratulations, now I am really looking forward to hearing what you think of it. Can I ask why the XLR if it is not balanced? The combination of blue and white LED's is stunning!

It looks like you have Mil-spec Sylvania's for the 1T4 stage and Mil-spec Raytheons for the 3S4 stage. I have that combination in reverse and I think you will enjoy the stock tubes greatly!

 

Hi Ian, thanks a lot for all your kind advice so that my customized TU-05 turns up as it is now.

I leave it to Shikada San to choose the LED's color to match up the champagne-gold color.

And he came up with that stunning blue and white combination.

 

Nothing particular about the XLR option.

It's just because I have a customized headphone cable that terminated on the 4 pin XLR, hence I think it would be nice if my TU-05 has that adapter as well. :o2smile:

 

Thanks for your view on that tubes combination. I wish the amp is already with me now... :tongue_smile:

post #2441 of 3488
Well that makes sense, that is how my logic works as well! I also think the XLR connectors are really good ways of connecting components ( I am an old Naim owner!)
Shikada San really got it right with that colour combination and you know it think the shade of gold he went with is just perfect.

If I were ordering the amp all over again I would go for gold and looking at your LED's I would go for that combo as well, just perfect!

I have a tube update. Now I have gone through a whole bunch of tubes and listening to audiophile recordings I am revisiting the music I really really enjoy, the likes of Neil Diamond and that ilk along with the wonderful HDDT recordings which are my favorite classical recordings.

I decided to dig out the mil-spec Mullards and have had them on all weekend with the Brimars and am just loving the rich, warm organic sound that has detail and soundstage but allows me to listen to recordings that are less than stellar in production values ( Not Neil, his albums are wonderful!)

This combo is just wonderful for that and everything is inky black in silence.

I am so grateful to Andy for bringing the Brimars to light they are just wonderful tubes and keep getting better with use. They are though very different beasts to the regular Brimars which are more easily available, much much better than those. If you see these red lettering Brimars come up again jump on them!
post #2442 of 3488
Ah not balanced. Less excited now but still stunning photography (am wanting a balanced amp for clas -dB, may go rsa). Presumably also you can only use 1x headphone output at a time?

Anyone see any logic to owning both 05 and 06?
post #2443 of 3488

Whoa, this is a cool thread.  Excellent stumble-upon.  LOVE the gold version . . .   

 

Hey Germanguy, I see you have the ALO Conti V2, as I do.  I am running HD800s and enjoying the combo, but wondering if you could give me an idea of the differences between it and the 05.  If this has already been discussed, my apologies.  163 pages and counting . . .    

I may have to buy this Shikada-san a sake, soon !

 

David

post #2444 of 3488
Quote:
Originally Posted by Dopaminer View Post
 

Whoa, this is a cool thread.  Excellent stumble-upon.  LOVE the gold version . . .  

 

Hey Germanguy, I see you have the ALO Conti V2, as I do.  I am running HD800s and enjoying the combo, but wondering if you could give me an idea of the differences between it and the 05.  If this has already been discussed, my apologies.  163 pages and counting . . .    

I may have to buy this Shikada-san a sake, soon !

 

David

 

The TU-05 has a maximum ouput impedance of about 200 ohms, so the HD800 sounds much to dark. i am looking for an alternative output transformer to solve this "problem".

post #2445 of 3488
Quote:
Originally Posted by GermanGuy View Post
 

 

The TU-05 has a maximum ouput impedance of about 200 ohms, so the HD800 sounds much to dark. i am looking for an alternative output transformer to solve this "problem".

Thanks.  His page says he can customize to match the `phones...  Would the AnalogueSquaredPaper 06 be better for hd800?  Sorry, I guess I should plow through the whole thread.....

How do you like your V2?  I`ve only got 115 hours on both it and the Sennheisers, so I`m still very much searching for options.....  

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