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Analog Squared Paper Discussion and Appreciation Thread. - Page 134

post #1996 of 3470
Quote:
Originally Posted by bmichels View Post
 

 

 

First, I believe that the vu meter mod should de done. It looks gorgeous !  just make sure that this has no consequences on the clarity of the signal...

 

- will do my best, a small interface has to be provided (4 germanium diodes, 1 resistor, 1 small capacitor perchannel + one switch (Average / Peak), so the connection to the signal has about 3KOhm.

 

Powersafe mode : I see that there are some long cables (to go to the Switch and to come back) coming from the pins of the tube. Are you sure that this do not alter tha sound ? 

 

- the wires are following the same path as the exsisting power lines, the switch only connects or disconnects a static voltage of 1.4 volt to pin 1 of the dl92, so switchted on, no change to before, switched off - just no current floating.

 

DAC ?  Will it be internal ?  Which one have you choosed ?

 

- formfactor, sound quality, price/performance ratio - HRT microstreamer DAC - a small little box i will provide an internal slot and two connectors for, could be removed and externally used at any time, fully powered by USB. an alternatiy would be the meridian explorer with 24bit 192 Khz, but a windows driver would be needed, not that universal and usable in the office with no right to install drivers.

 

Question: what is the benefit of having balanced input and balanced output is the internal design is NOT balanced ??

 

- a four pin mini xlr firstly is much better than a normal 3.5mm stereo jack. that you can connect a balanced source is a add-on. balanced equipment was primary designed for studio use with long cables because much better resistance against rf and other interferences. i think a double mono design is half way to balanced, only one amplifier per channel, but better channel separation as with one power supply and ground for both channels.

 

- a 4 pin xlr jack for headphone out makes sense, as this is the way the signals come out of the tu-05, two output transformers. also if you use a normal 3 pin stereo 6.3mm jack, you have to connect ground to ground, and then you have a connection between both amp parts. also it is the most universal connector. at the moment i am thinking of saving space by providing xlr to 2 speakers / 4 jacks and xlr to 6.3mm headphone out adapter cables instead of different jacks.

.

 

Anyway,  I love the project and believe that all the rest is for me very good ideas, including  the XLR headphone plugs that offer better contacts and rigidity than a JACK.

 

- what i forgot but will look if and think that the standard transformer output could also be used as preamp out, it makes no sense to implement an preamp out after the df91 stage as both df91 and dl92 stage together make this great tu-05 sound.

post #1997 of 3470
Quote:
Originally Posted by bmichels View Post
 

 

 

YOU MEAN :   RFT DF97 + RCA 1s4  COMBO ?   As good as  RFT DF97 +  philco 1s4 ?  different sound signature ? 

 

i think the philco has more of this philips sweetness and magic, also more realistic sounding and slightly wider and deeper soundstage, but letś give the rca's some burn-in time until my second philco set arrives.

 

the rca is definetely better sounding (for my taste) than the tugsram dl91, telefunken dl92, lorenz dl92, tung-sol mil spec dl92 and orion 3s4t i also tested with the rft df97 after one of the philcos was damaged.


Edited by GermanGuy - 9/5/13 at 4:03am
post #1998 of 3470

So, ... I really need to find those philco 1s4 !

  (Not so easy I guess after you bought the whole universe production of philco 1s4 ? )

 

And you GG, you need to test the Mullard 92 with the RTF97.  The only one left that can beat the philco 1s4:D 

 

 

 

 

HERE IS MY CURENT INVENTORY:

 

DF91 - Voltage Stage                                                                         DL92 - Power stage        

***************                                                                              ********************

Tunsgram 1T4T                                                                                  Sylvania 3S4  (US Army-1945 !)       

Mulard DF96 (nice yellow printing)                                                         Mullard 3S4   (1959)                                 Telefunken df904/1U4                <- Combo that I LIKE & use NOW ->       Philips dl 92/3S4

RCA 1U4 (orange printing)          <- stock Tubes - combo that I LIKE ->     Raytheron 3S4

Siemens DF91/1T4                                                                             Siemens DL/92 3S4

Lorenz DF96...but 2 of 2 différents types :-((                                          Tung-sol ken rad dl92 ( US Army-1950)

RTF DF97                                                                                          Tesla 1L33 

Mullard DF91 (with holes in the metal plates ! : ON ORDER )

                               

 

need to find philco 1s4   


Edited by bmichels - 9/5/13 at 4:36am
post #1999 of 3470

as mentioned before the philco were made by sylvania, i ordered some sylvania 1s4 to compare them with the philco's, also the sylvania 1s4 green box IS available on ebay !!!

 

i listened to the mullards but ianmedium mentioned that they need 30 hours of burn-in and that's hard to achieve.

 

the hole universe was just four tubes :-)

 

the big benefit of the philco's was or is, that it is the only tube i have without voices sometimes sounding slightly sibliant together with the rft df97.


Edited by GermanGuy - 9/5/13 at 5:06am
post #2000 of 3470

OK thanks.  

 

So can we assume that the sylvania 1s4 green box  sound EXACTLY like the Philco  ? ...or do we need to wait until you test them ? 

 

and...id you see some philco in a far far away place in the galaxy, can you PM me ?

post #2001 of 3470

GG this is for you: Discount on more than  2000 files 24 bits studio master .   Enjoy !  

 

(80% of my downloads are coming from QOBUZ)

 

post #2002 of 3470

thanks !!!!!!!!

post #2003 of 3470

after listening to some additional dl92's i recommend the rft df97 - philips dl92 combo for you! see my post

 

http://www.head-fi.org/t/632518/analog-paper-2-discussion-and-appreciation-thread/1860#post_9751896

 

btw, has qobuz its own download manager you have to use or can you just download the music - ? do they support android ????


Edited by GermanGuy - 9/5/13 at 9:30am
post #2004 of 3470
Quote:
Originally Posted by GermanGuy View Post
 

 

 

btw, has qobuz its own download manager you have to use or can you just download the music - ? do they support android ????

 

QOBUZ has his own download manager,  but also there is an Android and an iPHONE/PAD App.

 

And you can STREAM and/or download music

post #2005 of 3470
Just purchased an immaculate matched (both technical and date) Ken Rad's from the same seller I purchased the Raytheons from. I want to try an all American set up and until these Ken Rad's arrive I will make do with the Mil spec Sylvania's

But when the Ken Rad's arrive with the Raytheons I will have a complete set of matched technically and by date tubes in my amp and will report the results. The Ken Rad's like the Raytheons are war years NOS military stock.
Also, my amp was mailed on Saturday ( Sunday in Japan) and was marked as having left Japan on Sunday(my Sunday!) and for the first time since that notification it was updated this morning as now going through customs here in Canada.. They must be using Wilber and Orville Wrights flying machine to deliver mail between Japan and Canada! rolleyes.gif

So, hopefully customs will release it quickly and it goes out for delivery tomorrow, otherwise I will have to wait for Monday as the useless Canada post do not work weekends!
post #2006 of 3470
Quote:
Originally Posted by ianmedium View Post

Just purchased an immaculate matched (both technical and date) Ken Rad's from the same seller I purchased the Raytheons from. I want to try an all American set up and until these Ken Rad's arrive I will make do with the Mil spec !

Picture ?
post #2007 of 3470
Quote:
Originally Posted by bmichels View Post

Picture ?

Your wish is my command ! biggrin.gif
Processed By eBay with ImageMagick, R1.1.1.||B2||T0JKX0lEPTRmNjc4MmQ3YTU0NzI0NjQwNTE2MWQzNjIwZWM1YTA1MjAxYTkxNzMyMmY2fHxTRUxMRVJfTkFNRT18fE9SSUdJTkFMX0VCQVlfUVVBTElUWV9TQ09SRT00fHxDUkVBVElPTl9EQVRFPTkvMy8xMyA3OjQ3IFBN
post #2008 of 3470
Nice and IMMACULATE indeed ! Lucy Guy !
post #2009 of 3470
post #2010 of 3470
Quote:
Originally Posted by ianmedium View Post

he has two more matched pairs left!
http://stores.ebay.ca/VIVA-TUBES/_i.html?_nkw=3s4&submit=Search&_sid=30442602

 

Thanks, but I already have some Ken Rad dl92 ( US Army-1950), and after some testing, I am not a big fan of those tubes. I much prefer Philips DL92.

 

--> I rather  find some philco 1s4  :rolleyes:


Edited by bmichels - 9/5/13 at 2:42pm
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