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Analog Squared Paper Discussion and Appreciation Thread. - Page 204

post #3046 of 3475
Quote:
Originally Posted by mtthefirst View Post
 

It's arrived.

 

 

Congratulations again! this two color design and green illuminition looks absolutely outstanding. have to think of ordering one. can't wait to read your first listening impressions!

post #3047 of 3475
Quote:
Originally Posted by GermanGuy View Post
 

a headphone connected with an 6.3mm jack shares one ground line for both channels, where a 4 pin xlr connector makes it possible to connect the left channel of the headphone to the left output transformer and the right channel to the right output transformer without any connection between left and right, so completely separated.

 

I just found this previous post by you about seperate L & R channel grounding as opposed to the combined grounding found on the 6.3mm jack:-

 

 

 Originally Posted by GermanGuy

 

" 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."

 

Thanks GG,

so to be clear for my sake is your amp now running in balanced mode or is it now somewhere between single ended and double ended?

Just trying to keep up with all the technicalities.

Many thanks

post #3048 of 3475
Quote:
Originally Posted by mtthefirst View Post

It's arrived.











Congratulations! I am excited to hear your thoughts.
post #3049 of 3475

@bonitomino - my modified amp has totally separated left and right channels including two independent power supplies, but the amplifier channels are not a balanced design but a rebuild of the tu-05 SET left and right channel, so i call it double mono.

 

the only left-right GND connection at the moment is the input jack, because the two (small) input transformers i tested were not as good as hoped. next week i will order and connect two highend input transformers, and then the whole amp from input to output has no left-right GND connection, so completely separated.

post #3050 of 3475
Quote:
Originally Posted by ianmedium View Post

Happy New year everyone, back to normal now and home for me, GG, your Mods are looking amazing, well done sir, mtthefirst, congratulations, I am looking forward to your impressions.

Just a note to anyone who has sent me a PM this past month, I can see I have a few but I cannot access them. Not sure if its the system or my computer but I cannot get into them so whomever they are from I apologies for not replying, I can't see them!

Quiet for me, glad the AK240 has come along as I have little or no interest in it unless it pulls a rabbit out of the bag and manages to sound a great deal better than my AK120 so thats a relief, no emptying of pockets here.

I do have some news on the tube front. quite a while ago Shikada san wrote me and said he was going to try to find a pair of "TEN" tubes for me as he knew how much I wanted a pair and he has told me how good they sound. Well, he found a pair! He is going to use them in the 05 at a show in February and once that is over he will ship them off to me. They are in the 3s4 section so it will be interesting to see how they fair next to my favourites, the Phillips!

Currently I am running the Phillips/Mazda combo, a nice warm relaxing sonic signature with just enough sparkle, perfect for winters listening I feel. This combination as well suite the LCD's much better but still, my preference is either the T5P's or PF's

GG, once again, congratulations on such wonderful modifications, I am in awe.

I think this is going to be an interesting year on the ASP thread. I am very much looking forward to hearing what people think of the new transformers, who knows, I may be tempted to send my amp back to have them fitted!

 

Ian, congrats on your tube score, I know you must be excited. I have reservations as well on the AK240. Currently using my m8 to source my tu-05, continues to amaze paired with the th900's. I did get a ZX1, which on its own sounds absolutely fabulous, but for some reason I have yet to understand, doesn't play well with the tu-05. I have a Geek Pulse on order, which I think will do the trick, but I will have to wait several months for it to arrive.

 

 

Quote:
Originally Posted by AnakChan View Post
 

Congrats on the Ten! I'm still living with one and it's in the box waiting for partner (who may well not be compatible so probably a short term relationship). I wonder where he sources these things!! They're so hard to find!

 

Although I've had my TUR-06 since Aug, I hadn't really paid much attention to them until I got my Alpha Dogs and the synergy between them is (my)mindblowing. I've not tried tube rolling the TUR-06 on the ADs though. I can't remember what the Sylvanias are now that I've been on my NECs.

 

 

Are the Alpha Dogs at all similar in sound sig to the th900's? 

 

 

Quote:
Originally Posted by mtthefirst View Post
 

It's arrived.

Warning: Spoiler! (Click to show)

 

 

 

 

 

 

 

Congrats!

post #3051 of 3475
Quote:
Originally Posted by woodcans View Post

I did get a ZX1, which on its own sounds absolutely fabulous, but for some reason I have yet to understand, doesn't play well with the tu-05.

Are the Alpha Dogs at all similar in sound sig to the th900's? 
I'm curious about your ZX1/TU-05b pairing statement. What issue are you finding?

The AD's are completely different from the TH-900. They compliment each other. The AD's are more flat. Not as "fun" but more analytical. I like it in a different way from the TH-900's.
post #3052 of 3475
Quote:
Originally Posted by AnakChan View Post

I'm curious about your ZX1/TU-05b pairing statement. What issue are you finding?

The AD's are completely different from the TH-900. They compliment each other. The AD's are more flat. Not as "fun" but more analytical. I like it in a different way from the TH-900's.

I have tried sourcing the tu-05 with the ZX1 via headphone out and with two different LOD's. For whatever reason the sound is dull and lifeless, quite the opposite of what I hear when I use the ZX1 directly. And quite the opposite of what I hear when I source the tu-05 with the m8. Any thoughts?
post #3053 of 3475

Non-matching impedance problem ? 

post #3054 of 3475
Quote:
Originally Posted by woodcans View Post

I have tried sourcing the tu-05 with the ZX1 via headphone out and with two different LOD's. For whatever reason the sound is dull and lifeless, quite the opposite of what I hear when I use the ZX1 directly. And quite the opposite of what I hear when I source the tu-05 with the m8. Any thoughts?

Perhaps it is just as simple as the two not matching WC. I have that with my DT1350's, them and the 05 simply do not work together.
post #3055 of 3475
Quote:
Originally Posted by GermanGuy View Post


the four brimar df91 tubes (the tubes with the stamp on it) arrived today, also the additional four tung-sol mil-spec dl92's i bought because why ever i can't find four of the six tung-sol's i bought before.


 



you won't believe, i just found the four tung-sol dl92 i missed since august while taking a clean sweep and sorting all this electronic parts!
post #3056 of 3475
GG, I do believe it. I remember yesterday seeing a pair of tubes on ebay and thought, hey I would not mind those. Went to my box of tubes and I already have them!
post #3057 of 3475
Quote:
Originally Posted by GermanGuy View Post
 

today i called a tube seller to ask which tubes else would be compatible. not compatible in size and so tube socket, but electrically compatible it would be possible to build a desktop version of the tu-05 with this first generation battery radio tubes, it would look gorgeous i think:

 

Processed By eBay with ImageMagick, z1.1.0. ||B2

 

Processed By eBay with ImageMagick, z1.1.0. ||B2

 

just decided to buy and test this tubes and if working build a retro look tu-05 with this tubes - what do you think?


Edited by GermanGuy - 1/12/14 at 1:12pm
post #3058 of 3475
Well firstly I love the sound of Valvos and secondly if they work it will be interesting to see how they differ in sound to the radio tubes we use as standard.
Am I right in thinking the red ones need a cable and connector attached to the top silver part?
post #3059 of 3475

yes, i think it is the anode voltage connection!

post #3060 of 3475

GG, our AMP design expert :-), do you have an idea of what is this strange part inside this DartZeel LHC-208  DAC/AMP ?

 

 

this is inside this :

 

 

 

 

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