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The Stax Thread III - Page 96

post #1426 of 3333
Quote:
Originally Posted by DefQon View Post

Can you build me one?

maybe after I build myself one (which isn't happening anytime soon), but I skimmed over the whole unobtanium materials thing which seems to stop most people in their tracks. It also becomes a massive undertaking if you want to assume responsibility for the machining as well- something which I'm not willing to do for something this complex...

post #1427 of 3333

Yeah the casing and enclosure is a major PITA process for any build, let alone the mammoth size and task the DIY T2 is.

post #1428 of 3333
Try Megatron. It's all tube amp, and a lot easier to build.
post #1429 of 3333
Quote:
Originally Posted by DefQon View Post
 

Yeah the casing and enclosure is a major PITA process for any build, let alone the mammoth size and task the DIY T2 is.

 

Still more gigantic than a DIY T2. Here is the last prototype of a DIY headphone amplifier electrostatic (here for a modest SR-007 mk2) with high-voltage Tantalum tubes.
Prototype made by the designer of Demograf, Dimitry.
Photo sent by my Russian friend, Alex with this comment :

" Dmitry (Demograf) is now building new high-voltage amp for e-stats.  Couple of pictures of the prototype are attached.  The main unit has the “shining” high-voltage tantalum tubes, the power unit is separate – stands next to it.  007mk2 headphones are used for tests – because they are the hardest to drive.  The preliminary results of the sound of the prototype are great ".

 

 


Edited by eric65 - 2/2/14 at 3:17am
post #1430 of 3333

I have been working on a DIY T2 for 2 years. From time to time other projects move the T2 aside, I am working slow and patient on the T2.  The electronics are not hard to build, but I want to create striking casework and I am being very patient and drawing design after design to come up with just the right look.  I like polished copper so there will be some copper. The heatsinks are normal black aluminum and they will be exposed, forming the sides. I think the top will be made of black glass, holes drilled for the tubes, with chunky polished copper trim around the tube openings.   There will also be some exotic wood on the front - padauk, bubinga, lacewood or cocobolo- I am going to use the color of the wood to visually tie the copper front panel and the black glass top panel.

 

Here's a piece of cocobolo that I have, it's of the rosewood family (Dalbergia retusa) - you can see how the colors in the wood would visually tie the 1/4" thick copper front panel to the black glass top.  Only thing is, this wood doesn't have much "depth" or "fire" to the grain.  No chatoyance.  It is quite pretty though.

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

 

 

For the level control knob I have this...

 

I cut the volume knob out of tigers-eye, a semiprecious mineral....

Those aren't cracks, they are quartz inclusions

The whole thing is polished glass-smooth

You can't really appreciate how light "flows" through this material in a static photo.

This will have a narrow base machined from copper or polished brass.

 

 

On the inside I have a Goldpoint attenuator, etc.

 

The sad thing is that circumstances may force me to sell it shortly after I finish-  I've become disabled and can no longer work.  At any rate, creating something nice is a joy in itself.  More than half the fun, for me.  Way more.

post #1431 of 3333

But if you look at it, he is using NOS capacitors, those back ones are mean looking Russian NOS cap's, I'm sure you can substitute all those big caps for regular modern Panasonics or alike and the amp footprint will be much smaller. 

 

What tubes is he running?

post #1432 of 3333
Quote:
Originally Posted by DefQon View Post
 

But if you look at it, he is using NOS capacitors, those back ones are mean looking Russian NOS cap's, I'm sure you can substitute all those big caps for regular modern Panasonics or alike and the amp footprint will be much smaller. 

 

What tubes is he running?

I am beginner in this matter; I've just received this picture and this comment.
Maybe the forum experts will arrive to identify these tubes in looking closely at the photograph of original.

post #1433 of 3333
Quote:
Originally Posted by eric65 View Post
 

I am beginner in this matter; I've just received this picture and this comment.
Maybe the forum experts will arrive to identify these tubes in looking closely at the photograph of original.

Ok, I just realised those two big tubes are used for rectifying in the PS with all the transformers, I'm more interested in what tube his running for the amp part, the two brightly glowing ones sure as hell not 845's as they don't have leads coming out from the top, I think the Stax mafia are interested in any tubes out there able to be pushed through 700vdc+ on the plates for there next project without going to complicated, last I read that is till either KG or Birgir can chime in.

 

What's Dimitry's website? If he has one.

post #1434 of 3333
Hey there,
I'm looking for a decent speaker amp to pair with my sr3/srd-5.
I'd like it to be relatively small for my desktop and under $200
So far the only good candidate is the emotiva mini x .

Also could use any advise about stax products as I plan I upgrading down the line.
post #1435 of 3333
Quote:
Originally Posted by James-uk View Post

Especially on the STAX thread? Is this thread immune from logic and reason? I was simply stating the facts. Just like the fact that e stats are the best headphones. It's a fact not a debate.
You were not stating any fact, but your opinion, and we are OT
post #1436 of 3333
Quote:
Originally Posted by Rawdawg3234 View Post

Hey there,
I'm looking for a decent speaker amp to pair with my sr3/srd-5.
I'd like it to be relatively small for my desktop and under $200
So far the only good candidate is the emotiva mini x .

Also could use any advise about stax products as I plan I upgrading down the line.

Well, the emo works fine with the energizers.. Can't really tell you much more than that.

post #1437 of 3333
Quote:
Originally Posted by DefQon View Post
 

But if you look at it, he is using NOS capacitors, those back ones are mean looking Russian NOS cap's, I'm sure you can substitute all those big caps for regular modern Panasonics or alike and the amp footprint will be much smaller. 

 

What tubes is he running?

 

Those are Eimac 35T's (or Russian copies). They have a mu of about 40, take a minimum of about 700V on the plate, and have a very high rp . Since there is only one per channel, I'm assuming they're loaded with some sort of  center-tapped choke (it would have to be a "beast" both in terms of inductance and voltage/current ability ) and then capacitor-coupled to the headphones. Not the most practical approach to a DHT electrostatic amp, but If you don't mind the caps in the signal path, or the extreme power requirements, no reason it shouldn't work.

 

I have a  transformer-coupled 845 electrostatic amp in development. It's  a huge project, but  a bit more "real world" than this one.


Edited by FrankCooter - 2/2/14 at 8:14am
post #1438 of 3333
Quote:
Originally Posted by DefQon View Post
 

Ok, I just realised those two big tubes are used for rectifying in the PS with all the transformers, I'm more interested in what tube his running for the amp part, the two brightly glowing ones sure as hell not 845's as they don't have leads coming out from the top, I think the Stax mafia are interested in any tubes out there able to be pushed through 700vdc+ on the plates for there next project without going to complicated, last I read that is till either KG or Birgir can chime in.

 

What's Dimitry's website? If he has one.

 

Try to contact by PM Oingo Boingo = Alex (Alexander) (the owner of the Demograf as well as a beautiful collection of headphones) ; Alex seems well know Dimitri and his past achievements; Maybe can you it inquire about all these tubes (much more than me)

 

Here some links on Alex (Oingo Boingo) and Dimitry

http://www.head-fi.org/t/677809/the-stax-thread-iii/60#post_9737391

http://www.head-fi.org/t/677809/the-stax-thread-iii/75#post_9737962

post #1439 of 3333

  

 

As long as we're discussing "home-brew" DHT electrostatic amps, here's my 845 based amp. It's a single-ended 3 stage design. 1st stage is a CCS loaded 6N7 direct-coupled to a 45. 2nd stage is a 45 driving an interstage transformer connected to the 845 grid. The 845 output drives a custom high level Electra-Print phase-splitting transformer.Running the 845 with fixed-bias at 650V@60mA. Power supply was originally based on mercury rectifiers, but am currently working on a hybrid solid-state/tube regulated supply. Not the most practical project, but definitely a lot of fun and a completely different presentation from most other electrostatic amps.

post #1440 of 3333

a thing of beauty for sure.

 

frank has retro down to a science.

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