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Best DIY amp? - Page 3

post #31 of 51
Thanks, Colin. I know a DAC is the next step and something that I need to learn about. I don't understand a lot of the lingo yet, much less the digital electronics behind it. When I'm ready to dive in, I'll shoot you an EM and we can talk some more.

I was worried for a minute about hijacking this thread but I think it is important for the OP to see the long dark slide he is about to make
post #32 of 51
Quote:
Originally Posted by tomb
If I'm not mistaken, despite the simplicity and low cost, the SOHA still uses the typical 100+ voltage to drive the tube. I haven't studied the YAHA yet, but it appears to be a super-small tube-in-a-tin version of a CMoy. AFIK, the Millett is still the quality option DIY tuber down in the 12-24V range of solid-state.
Yeah, but the real fun starts with tube amps at above 250V, when we can finally get the tubes to drive the headphone without a solid state output. And the costs get nice too...
post #33 of 51
Thread Starter 
First DIY amps... now DIY DACs... looks like I'm going to have a busy summer
post #34 of 51
why not a tubed amp?

if I have the funds, I will make andrea's "no compromise tube amp" (in headwize library).

I was looking at the latest gilmore design but 30W (not really sure of the figure) output for a headphone amp is crazy IMO. But different strokes for different folks. I like tubes best.
post #35 of 51
The most audacious DIY amp in my opinion is the DynaMight. There's nothing inexpensive or easy about it. I've been hacking at one, and should dedicate more time to it when I get a couple other projects knocked off in the coming weeks. Take a look at that if you really want to go to an extreme.

You might also be interested in the Dynamid, as mentioned earlier. And speaking of which, I just sent more money to Dan Gardner tonight. Sooner or later, I'll put together one of these, too.

Another one I'm working on is Millett's SRPP ECC99 amp for the AKG K-1000. Interesting design, and he does have a circuit variation for headphones other than the K-1000. It's worth looking at, though be warned about the transformers. They must be ordered from England. They're about $200 USD for the pair and have about a 3-4 lead. I ordered mine around 5/1, so I've got another week or two.

Those complaining about test equipment accumulation are correct... the lab is growing.
post #36 of 51
Quote:
Originally Posted by Uncle Erik
There's nothing inexpensive or easy about it.
when it comes to expensive, you don't have to look no further than tube amps.

NOS tubes. quality hig voltage caps are not cheap. + the transformer. it has to be potted of course.
post #37 of 51
Quote:
Originally Posted by Uncle Erik
Those complaining about test equipment accumulation are correct... the lab is growing.
That's half the fun... err, pain.
post #38 of 51
Quote:
Originally Posted by 00940
Yeah, but the real fun starts with tube amps at above 250V, when we can finally get the tubes to drive the headphone without a solid state output. And the costs get nice too...
I managed to find a bunch of Hammond 110 to 220 and 110 to 600 transformers, and a big old Hammond choke. I can't decide if I shiould sell them - or keep them for a tube amp..


On to other things: Building amps and general DIY starts to get really crazy once you start doing your own PCBs and laying out your own schematics. I'm reading and re-reading Horowitz and Hill's Chapters 2 and 3 to understand BJTs, JFETs and MOSFETS. I really want to design a headphone amp with a BJT front end and use complimentary MOSFETs in a push-pull configuration for the output stage.
post #39 of 51

Uncle Eric, 

 

You have build a Millett ECC99 headphone amp for the K1000. Do you use it still and are you satisfied with the result of your DIY project. I use mine every day with great joy but without any reference material I'm wondering if there's a far better amp.  What is your opinion?

 

Johan

post #40 of 51
Quote:
Originally Posted by jrietveld View Post
 

Uncle Eric, 

 

You have build a Millett ECC99 headphone amp for the K1000. Do you use it still and are you satisfied with the result of your DIY project. I use mine every day with great joy but without any reference material I'm wondering if there's a far better amp.  What is your opinion?

 

Johan


Uncle Erik quit posting a few years ago.  I'm not sure anyone ever figured out what happened to him.

post #41 of 51
Quote:
Originally Posted by tomb View Post


Uncle Erik quit posting a few years ago.  I'm not sure anyone ever figured out what happened to him.

 

It was mentioned elsewhere on head-fi that he moderates another site. 

He posted 24minutes ago. 

 

No idea why he stopped posting here though. My google-fu is not that strong. 

 

At least he is OK. I miss him. 

post #42 of 51

Holy thread resurrection. Since I'm here, out of curiosity, what's the budget like to build a DynaMight, casework included?

post #43 of 51

Awfully hard to say. A lot of the parts are obsolete and difficult to source. Four matched quads of 2sj74/sk170 will cost you 130$ from a reputable seller. You'll probably need to replace the output transistors by others too. You'll also need to produce new PCB and in small series, you're easily in for 150$. Add the PS, biggish enclosures, and so on and I doubt you'd be much under 800-1000$ for a basic build. If you get crazy for the volume control, you can easily add a lot of money. The same if you want custom faceplates and the like.

 

Crazy build anyway. For most headphones, totally overkill.

post #44 of 51
Yeah I figured as much. Thanks for the info!
post #45 of 51
Quote:
Originally Posted by elmoe View Post
 

Holy thread resurrection. Since I'm here, out of curiosity, what's the budget like to build a DynaMight, casework included?

I am actually working on one right now.  Kevin Gilmore just came out with a new set of boards for the Dynahi (2 of them makes a Dynamight) with on board head sinks.  That reduces the cost by quite a bit and also reduces the number of headaches.  I believe he also updated all the parts on it so its about $100 per board.  He also recommends using Sigma22's as power supplies with very very large transformers.  Thats another $250 (2 sigmas, 2 transformers)  With a basic 2 chassis build you are looking at around $700.  Thats not including a nice stepped attenuator, custom milled chassis, or any other board you might want to put in there for kicks like a relay. I think going all out mine will come out to be a be close to $1100.

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