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Analog Squared Paper Discussion Thread. - Page 168

post #2506 of 3704
Quote:
Originally Posted by GermanGuy View Post

BRIMAR DF91?

Brimars 1T4 

 

post #2507 of 3704

Going for the 4-pin XLR was just for connectivity, right ? ?  ?  

post #2508 of 3704
Quote:
Originally Posted by Dopaminer View Post
 

Going for the 4-pin XLR was just for connectivity, right ? ?  ?  

yep ,  still UN-Balanced  :-)

 

but much more robust that the 1/8 jack, and....a big XLR impress the girls more :-). ( I have to admit that I was hoping some better channel separation by having right and Left ground not connected together... But it did not happend :-( ! NADA !..)., :-)


Edited by bmichels - 10/21/13 at 11:48am
post #2509 of 3704
Quote:
Originally Posted by Sam Edwards View Post

Hey GG,
How do you identify the pins to Jumper on the DF97? Are there markings to identify them? And what did you use, a little wire and solder? 
I put the same questions under the photo...
BTW Are there any more tube cleaning kits available in the US?

Shoot me a pm.
post #2510 of 3704

New tools and parts arrived today:

post #2511 of 3704

From an admirer

You are a legend GG

post #2512 of 3704
Quote:
Originally Posted by Dogmatrix View Post
 

From an admirer

You are a legend GG

 

Yes.

post #2513 of 3704

2 x Thanks a lot ! i feel really honored!

post #2514 of 3704
Indeed you are GG!
post #2515 of 3704
Quote:
Originally Posted by bmichels View Post
 
Quote:
Originally Posted by Dopaminer View Post
 

Going for the 4-pin XLR was just for connectivity, right ? ?  ?  

yep ,  still UN-Balanced  :-)

 

but much more robust that the 1/8 jack, and....a big XLR impress the girls more :-). ( I have to admit that I was hoping some better channel separation by having right and Left ground not connected together... But it did not happend :-( ! NADA !..)., :-)

 

 as i now know that shikada san sells me a second internal power supply board it is possible to mod the tu-05 even with the small case to be really double mono from input jack to output transformer. and as in the first step i want to separete left and right channel in my existing amp to test this, ... i think i can try also to integrate the second internal power supply board and bias voltage battery pack  (but not the secound Li-Ion battery pack, not enough space left in the standard case to do this).

 

i have planned to do this during christmas holiday.

 

at the moment i am happily awaiting the new extended tu-05 case (without any holes), should be here next week, together with 4 additional tu-05 style switches, a second Li-Ion battery pack and a second bias voltage battery pack (and a second capacitor that is only used one time  for both channels and obviuosly has to be doubled when separating the left and right channels power supply and ground lines).

 

what a nightmare to again prepare a photo documentation :smile: 


Edited by GermanGuy - 10/21/13 at 4:24pm
post #2516 of 3704

what do you think?

 

 

a lcd simulating an analog vu meter (but only 9 steps), 5 .. 12 volt, needs only 250 µA, size is 22mm x 44mm!

post #2517 of 3704

btw, the device top right on the new tools and parts image is a RF tube driven radio signal generator HEATHKIT SG-9:

 

http://www.radiomuseum.org/r/heath_rf_signal_generator_sg_9.html

 

 

The generator can generate RF signals in the range of 160 KHz to 110 MHz and also the RF signal can be modulated with an audio signal. if you use a small antenna this is something like a mini radio station. i got this device for just 16 euros on ebay and will use it to test the shielding and resistance of my modded amp against RF interferences. and how funny inside are two tubes, one of them is an ECC82, if you buy a NOS one, you pay 30 euros for the tube alone.


Edited by GermanGuy - 10/21/13 at 4:25pm
post #2518 of 3704

btw, good luck i found a local company specialized in making custom aluminium parts just 500 meters away from my home. they have a large hall full of high quality sofisticated and large aluminium CNC shapers, drilling machines etc, they can do anything you want with aluminium, in my case and for my case they will drill all the needed holes into my new tu-05 case.

post #2519 of 3704
GG,

You, your ideas and your ability are amazing. Please continue to keep us informed of your progress. And when you finally get your amp to the point that you are satisfied, please, please sell one to me. Just marking my place as first in line. wink.gif
post #2520 of 3704

While ordering a standard collection of electronic parts and components i found that the german electronic tools and parts shop i ordered the parts from also offered some tubes, so i checked this and found them selling NOS DF91 tubes (in german language tube = Röhre). while there is no guarantee which manufacturer you get tubes from on the picture a Radiotechnique DF91 was shown so i ordered ten pieces just for fun.

 

And you won´t believe i got 10 NOS Radiotechnique DF91 looking like fresh from the factory in the original cardboxes for 50 european cent per piece !

 

http://www.pollin.de/shop/suchergebnis.html?S_TEXT=DF91&log=internal


Edited by GermanGuy - 10/22/13 at 2:32am
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