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Analog Squared Paper Discussion and Appreciation Thread. - Page 137

post #2041 of 3488
I will certainly do that!

I have sometimes called GG Heath Robinson. He was a famous cartoonist in England many years ago. Most famous for his wild and wacky inventions. I think Bmichels can now be called that as well and obviously this is with great affection and respect.

Here is a link to Heath!
http://www.heathrobinson.org

In England, with my generation, when anyone invented something outside of the box that captured imagination they were called Heath Robinson or the invention was called that!
post #2042 of 3488
Quote:
Originally Posted by ianmedium View Post

Cheers WC, though my attempts are strictly amateur in comparison to the two Nutty Europeans! biggrin.gif One revision I am going to make as I want this to be a poor mans Nagra isolation system is to replace the plywood with two plates of aluminum. I will then put blu-tac between the plates to replicate what they do. I have found a place locally that sells Aluminum so I am going to get them to cut me two pieces to the right size!

In the mean time I am trying to make the weekend go fast so have been out today flying to take my mind of waiting for the Amp!

 

why strictly amateur? interestingly you are now have choosen the same design i also found worth to be used as you now have a heavy plate as base, then a second plate of lower mass separated by dampers and then the amp and i assume some granite on top. so similar to turntables the heavy mass absorbing resonances but also beeing a stable base, the second mass / damper with a different resonance frequency decoubling the amp from any resonances or movement!


Edited by GermanGuy - 9/7/13 at 11:07pm
post #2043 of 3488

bmichels - you asked, so here is my answer:

when doing my mod first off all i will rearrange all components inside the amp to minimize cable length and better separate

 

- input from jack to tubes

- output from tubes to output jacks

- power lines from battery to internal power supply pcb to tubes

- improve central ground connection for both channels

the whole input path:

- i will replace all the cables and wires from the input jack to the tubes

- rewiring the connection between input jack(s) and potentiometer

- replacing the thin shielded stereo cable from potentiometer to tubes

- the tube sockets are mounted on the tube panel and decoupled from the electronic parts by thin wires to decouple the insertion movement of the pins from the solder points and electroinc parts:

- as this is start and end of output and input part .... i will replace this thin wires by 0.5mm pure silver wires or lcofc copper ones.

the power lines:

- thicker cables from battery to power switch

- adding capacitors after the power switch and a thicker cable from power switch to internal power supply board

you can keep the cables for the led's for the potentiometer as they are.

 

the output path:

- replacing the wires from tubes to impedance switch to output transformers and output transformers to the output jacks

ianmedium had posted a picture of this nicely modded and recabled tu-05 (can you repost it?), would be a good example for you as the layout is the original one.


Edited by GermanGuy - 9/8/13 at 2:36am
post #2044 of 3488
Quote:
Originally Posted by ianmedium View Post

You two mad Europeans with your crazy modifications biggrin.gif I am in awe!

 

i feel as world citizen :smile: ........

post #2045 of 3488

bmichels . just two suggestions:

 

if you want to solder the df91 tube sockets pins 4 and 5 together, even when partly disassemling the amp you have about 8mm of space for the soldering iron to solder the pins of the second df91 socket, so the diameter of the soldering iron must be less than 8mm. you should buy and use the smallest one you can find (but maybe you already have one), using my larger one i touched and nearly molded one of this yellow capacitors:

 

http://www.conrad.de/ce/de/Search.html;jsessionid=A6AF9D7ACD330B505957B81852C4904D.ASTPCEN01?search=l%C3%B6tnadel

 

on the left side of the picture you can see the yellow capacitor and the tube socket UNDER this capacitor to be soldered:

 

 

and the blue arrow shows the power line to pin 1 of the dl92 tube socket. behind the soldering point and the white cable going to the left is a small 5mm long silver wire going to pin 1, can just be cut, so to summarize the power save and "use 1s4 and 1f33 tubes mod" was much easier to implement than soldering this df91 tube pins.


Edited by GermanGuy - 9/7/13 at 11:31pm
post #2046 of 3488

Thanks for the advice.  

 

And don't worry about "micro" soldering... I have designed & built a 1 Gramme radio-controled airplane ( 3 proportional channels= rudder, trotle, elevator), doing the soldering under magnification glasses...  

 

Here is the plane in my hand.

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 85

 

 

 

 

post #2047 of 3488
wow, that's great, sorry small! !!!
post #2048 of 3488
When people tell you that our TU-05 is not portable enough, just show them this beast of... 100 lbs. :-)


Edited by bmichels - 9/8/13 at 7:30am
post #2049 of 3488
and that beautiful!
post #2050 of 3488
I was looking for some more Philips DL92 and à vendor told me:

" I have Philips DL92 rebranded Telefnken, D getter version  DL92 Telefunken 3S4 CV820"

Does that make sense ?
Can I consider them as " réal " Philips DL92 ?
post #2051 of 3488
Yes, that makes a great deal of sense, that often happens with tubes and I have heard of these re-branded Telefunkens made by phillips
post #2052 of 3488

 

These are probably my favorite looking full sized tube amps ever.

 

They are actually huge! 

 

 

 

 

EDIT

 

The Lars 2 at approximately $75K a pair


Edited by spkrs01 - 9/8/13 at 8:32am
post #2053 of 3488
OK, if it is tube porn we are going to this Sunday Morning then... This pairing would make up part of my dream home system!




By the way, the pair you both show are beautiful as well but I have such a soft spot for Nagra and I am friends with the designer of the speakers I show here so it is a match perfect for me. All I would have to add is an SME turntable and DCS digital system and I would never leave home! biggrin.gif
Edited by ianmedium - 9/8/13 at 8:39am
post #2054 of 3488
Quote:
Originally Posted by ianmedium View Post

OK, if it is tube porn we are going to this Sunday Morning then... This pairing would make up part of my dream home system!




By the way, the pair you both show are beautiful as well but I have such a soft spot for Nagra and I am friends with the designer of the speakers I show here so it is a match perfect for me. All I would have to add is an SME turntable and DCS digital system and I would never leave home! biggrin.gif

 

Ian,

 

I listened once to those Voxativ Ampeggio Due, and they sounded gorgeous  !  They are also on my wish list...!  

 

As for Nagra, I believe that, instead of DCS,  you should add this New Nagra DSD/PCM DAC to your wish list to connect to the Nagra 300P. It is supposed to be available in October for... 12.000 € to 16.000 € depending on the power supply choosed.  It's headphone out is supposed to be of the highest quality, and it also support NAS.  I already have an appointment to listen to it on November 5th :-)))

 


Edited by bmichels - 9/8/13 at 11:08am
post #2055 of 3488
Now that looks very interesting indeed! The only thing I have against the DSC stack is that it is a lot of boxes and very complex in use and I love the industrial simplicity look of Nagra gear.. Though, Voxative's own pre and power amp are meant to sound wonderful as well!

I have just finished giving the pins of the Phillips/Mazda combo a clean with alcohol in preparation for tomorrow. A gentle rub with a lens cloth as well has brought up the glass to a nice shine!

AppleMark

As well has my headphone jacks and interconnect ( I am going to use the Cardas first off as I am familiar with it and I really want to hear what the line out of the 120 is like so I want to use familiar equipment so as to pass a comment on it!
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