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Dsavitsk/Beezar Torpedo Build Thread - Page 16

post #226 of 400
6/27/12 at 6:52pm

Looks splendid, you guys are doing the DIY community a great service by offering this amp at such a low cost.

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post #227 of 400
6/27/12 at 7:42pm

It carries it names really well. It does look like a torbedo. What are the dimentions of the outside case?

 

The second link is dead, by the way.

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post #228 of 400
6/27/12 at 8:16pm
Nice pics TomB!

I think you already know what the next question is going to be.... wink.gif
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post #229 of 400
6/27/12 at 9:40pm
Quote:
Originally Posted by HiGHFLYiN9 View Post

Dsavitsk, would a balanced drive option be worthwhile running two of these new boards in parallel... or would it be an act of pointlessness?

I'm going to have to say pointless. There are many ways to build a balanced tube amp, but that really is not one of them.
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post #230 of 400
6/28/12 at 3:37pm
Thread Starter 
Quote:
Originally Posted by KimLaroux View Post

It carries it names really well. It does look like a torbedo. What are the dimentions of the outside case?

 

The second link is dead, by the way.

fixed ...

Quote:
Originally Posted by jdkJake View Post

Nice pics TomB!
I think you already know what the next question is going to be.... wink.gif

Yes - dsavitsk and I are still working on it.  The toroid reduced the noise by about 90%.  Unfortunately, it's still detectable in certain headphones.  We are going to try a few other specific things and let you know.  I should have one of those things tried out this weekend and have the results.

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post #231 of 400
9/18/12 at 1:45pm

Sorry to bump an old thread.  Has there been any updates on this?

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post #232 of 400
9/18/12 at 5:28pm
Thread Starter 

I'm in the process of sending my toroid prototype over to Dsavitsk (it's taken awhile - been quite busy with non-headphone stuff, dang it!).  He has a solder-desolder re-work station that has more capability than my equipment.  I can't get the OT's removed without trashing them and the latest thing we were trying is to shield the OT's, which will require their removal.  That's about as much as I can tell you right now.

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post #233 of 400
9/18/12 at 6:09pm

My fat wallet is waiting .... and the soldering iron is getting rusty !!!!!

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post #234 of 400
9/18/12 at 7:49pm

Having finally gone through this whole thread, I must say.. once the new kits are released with the toroid, I will probably be getting myself one of these to pair with my Magnums.

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post #235 of 400
9/18/12 at 7:56pm

Still using mine almost everyday, its a fantastic amp.

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post #236 of 400
9/19/12 at 11:25am
Quote:
Originally Posted by chiguy View Post

Sorry to bump an old thread.  Has there been any updates on this?

Not an old thread, just a slow one. We are hopeful for some answers soon ...

... which I think we've said before. Rest assured that we are working on it, and if we hit a point where we aren't, we'll let people know.
Quote:
Originally Posted by DingoSmuggler View Post

Still using mine almost everyday, its a fantastic amp.

Great to hear smily_headphones1.gif
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post #237 of 400
10/13/12 at 9:22am

Hallo,

 

I come from the solid-state department and would like to build the torpedo as a first tube project.

Since I alway wanted to built a point-to-point setup (I always admired the raw beauty of that), I wonder if there is any chance that the short kit is also available without case and pcb?

The custom transformers seem mandatory for this amp.

 

I guess, by building a separate enclosure for powersupply and amp, one can easily avoid the humming problem that may occur and still use the EI-core trafos.

 

Regards

Flo

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post #238 of 400
10/13/12 at 11:24am
Thread Starter 
Quote:
Originally Posted by cubeasic View Post

Hallo,

 

I come from the solid-state department and would like to build the torpedo as a first tube project.

Since I alway wanted to built a point-to-point setup (I always admired the raw beauty of that), I wonder if there is any chance that the short kit is also available without case and pcb?

The custom transformers seem mandatory for this amp.

 

I guess, by building a separate enclosure for powersupply and amp, one can easily avoid the humming problem that may occur and still use the EI-core trafos.

 

Regards

Flo

We've reduced the hum significantly through the use of a toroid PT.  I'm not sure whether we'll ever eliminate it completely with certain headphones, but that's not that unusual for tube amps in this price range.

 

Yes, the custom transformers are mandatory for this amp.  Since the short kit from Beezar only contains the case, the PCB, and the transformers, you're essentially asking if you can just purchase the transformers.  I think not, because we don't have "extra" stock.  Besides, they are custom fabricated not only for the winding/turns ratios, but also for a PCB.  The only connections are PCB pins.

 

Just an FYI, but one of the reasons the Torpedo is a safe alternative for building a tube kit is the use of the PCB. wink.gif

 

Anyway, I would suggest that you refer to the several excellent articles that Dsavitsk authored on the L'esspresivo - that's what forms the basis of the Torpedo design with its PCB:

http://www.ecp.cc/less-pressivo.html

http://www.ecp.cc/less-pressivo-build.html

http://www.ecp.cc/less-pressivo-plus.html

http://www.ecp.cc/less-pressivo-plus-plus.html


Edited by tomb - 10/13/12 at 11:26am
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post #239 of 400
10/13/12 at 12:21pm
Thread Starter 

BTW,

 

Maybe Dsavitsk will post with more details, but it's not really hum (60 Hz) - or even ripple (120 Hz).  There's a small spike at around 180 Hz that has shown up for both of us in tests.  Depending on the production variance of the OT's and certain headphones, that spike runs about 2dB into audibility.  The difference is quite small and is essentially the difference with the lid on vs the lid off.  The toroid is what brought this down to about 2dB audibility.  The last thing we tried for removing it the rest of the way was shielding the OT's, but according to Dsavitsk, it made no difference.

 

Meanwhile, I have sold several of the short kits with the old PT while we were fooling aorund with the toroid.  I have had no complaints and one individual is even selling them in "built" form.  The last PT version I built was modified with the addition of a choke.  I would highly recommend the choke on the non-toroid version.  It may just be the choke adds extra metal inside the case and that "blocks" the interference, but the existing version is definitely quieter with a choke.  Also, I put in some cheap Solens for the heck of it and amazingly, they sound every bit as good as the Clarity caps.  I think that's more an indication that Dsvatisk's design is not as susceptible to quality cap changes, than any sort of luck with the Solens.  Bottom line, I could tell no difference.

 

I have been listening to the non-toroid version almost exclusively for the last week or two.  With my pupDAC and Grados or Sennheisers, it sounds wonderful.  You practically have to train yourself to hear the "ripple."  Even then, it seems to have no effect on the music.


Edited by tomb - 10/13/12 at 12:22pm
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post #240 of 400
10/13/12 at 2:51pm

Thanks for your reply, tomb.

 

Ok, I figured, that it would be too much to ask, selling the transformers separately. Of course I would be willing to buy the hole short kit as well (with the PCB and the nice case lying around useless afterwards), but in your post it sounds that the print-transformers could not be used properly in a point-to point setup.

 

I have to admit, I have never done a point to point setup, and I believe you that it could be difficult with the wrong parts. So, thank you for this information.

On the other hand, I have built anything solid state, from source to poweramp, so I am not afraid of high voltages.

 

Of course, I have already been reading into the mentioned links on the l´espressivo, but the choice of transformers seemed critical (and expensive, depending on the tranformer) for the use with grado headphones, so I thought I might just ask for the "stock transformer package" and maybe get a hint or two on the way.

 

I understand that, if a "non-stock" version of the torpedo is the aim, maybe this is the wrong tread to post, so I will do some reasearch of my own and maybe find help in another thread or forum.

BTW, it is not just about the (maybe noexisting) "hum" , but I really want to make a "diy wrapping" of the hole package.

 

Thanks,

Flo


Edited by cubeasic - 10/13/12 at 2:54pm
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