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Old 2nd April 2012, 06:30 AM   #1
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Default Looking for a new project. Anything similar to the Schiit Lyr?

I was pretty happy when I test drove the Lyr (http://schiit.com/cart/index.php?mai...&products_id=3) and it was nearly exactly what I was looking for except not DIY friendly.
Any tips as to what I should search for?


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Alfa
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Old 2nd April 2012, 06:34 AM   #2
tinitus is offline tinitus  Europe
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moved to head amp


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Old 2nd April 2012, 06:42 AM   #3
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moved to head amp


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Sorry about that. I also have a thread regarding headphone amps in the Chip Amp section.
Thanks!
Alfa
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Old 7th April 2012, 11:11 AM   #4
regal is offline regal  United States
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There are many similiar designs posted on the internet, basically a tube gain stage with a mofset output. The good thing is a high Vrms output since the classic OPT is replaced by a mosfet output, the problem is dc servo or caps (pick your poison) and tube speaker amp level distortion. Do you really need that much power? If you do I would recommend Beau's hybrid aikido thread in the tube forum, he has tackled mainy of the problems with hybrid amplifiers.
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Old 11th April 2012, 11:42 PM   #5
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Perfect. Thanks. I don't NEED that much power but it would be nice. I was also considering making one for a friend who has been considering the Lyr for a while.
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Old 12th April 2012, 12:14 AM   #6
regal is offline regal  United States
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The nice thing about Beau's method using the Tubmos is Lateral Mosfets, you aren't going to find those on any store bought headamp. Also see DDE's page DDDAC 2000 (look for the tubmos page). Also someone had a DHT-Mosfet headamp design posted here last year that simulated nice don't know if anyone built it though. Its an interesting subject 'cause you gain a ton of power by substituting silicon(mosfets) for iron (output transformers) and you save money.
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Old 12th April 2012, 11:14 AM   #7
rjm is offline rjm  Japan
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Quote:
Originally Posted by alfa147x View Post
I was pretty happy when I test drove the Lyr (LYR Schiit Lyr 6W Hybrid Headphone Amplifier [] - $449.00 : Schiit Audio, Headphone amps and DACs made in USA.) and it was nearly exactly what I was looking for except not DIY friendly.
Any tips as to what I should search for?
So other than having tubes and MOSFETs, any hints about the actual circuit?

I see two twin-triode tubes and four MOSFETs and what looks to be two power transformers (high, low voltage most likely). Blurb says 6 W / 32 ohms, that means push-pull output, and it also says zero feedback. Something called "Dynamically Adaptive Output Stage" which could be a number of things ranging from very clever to the pathetically simple but end result is a transition from single ended at low output power to push pull operation at high power.

Burns 30 W, can output 40 V p-p (~+/-24V rails on the output stage)

So what are you looking for exactly? Since a tube voltage stage and a MOSFET output stage are two independent circuit blocks, you can take any MOSFET buffer (singled-ended or push-pull) and any configuration of tube voltage stage and roll your own at will.

You can be be a little clever and weld the two together, like this , but to be honest you don't gain all that much from doing so.
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Last edited by rjm; 12th April 2012 at 11:21 AM.
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Old 12th April 2012, 01:03 PM   #8
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How about something like a Borbely EB-804?
Sorry I can't link to a site, Erno Borbely retired
and shut his site down. Google is your friend...
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Old 28th April 2012, 10:18 AM   #9
regal is offline regal  United States
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I pike up a Lyr, its a nice design. I think a DIY version would cost considerably more but the reward could be great. I think the tube stage could be improved upon with B+, better tube operating point, etc. And obviously a better power supply for the mosfet stage. Obviously this will cost much more money that the Lyr, so I wouldn't want you to think of a diy Lyr as being a means to save money.

Basically following the hybrid aikodo topology. Where we have a near perfect preamp stage followed by a push-pull lateral mosfet buffer. The tubmos is one option but a better one may be to use the Thor output (using the jfets just to bias the mosfets) , the jfet should be quiter than the TL431 in the tubmos.

I think the main goals of the project should be better Power supplies/transformer, betterdrive from the tube stage (operatng point topolopgy), better tubes than the 6Dj8's and lateral mosfets. Would be great to get in all on one PCB. A lot of fertile ground for the ortho owners.

My time is lmited but I could put together a schematic and simulate with LTspice. I'm still on a lot of OT. But desiging board is too time consuming with my work schedule.

If there is interest I think we should start a new thread.

Lets face it lowish distortion >2W into 38 ohms (non balanced) is a project worth pursuing for the group and the hard work has been done by beau with his speaker hybrid.
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Old 28th April 2012, 10:19 AM   #10
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What an unfortunate choice of name.

In English that is Sierra (S) Hotel (H) India (I) Tango (T) Liar.
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