Explendid amplifier designed by Michael Bittner, our MikeB

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#2,364
00940 said:
As much as I like the symasym sound, I can only suggest you to have a look on this for your grado : http://headwize.com/projects/showfile.php?file=gilmore3_prj.htm

You can simplify a bit the power supply (a lm317/337 pair is good enough). With grado, this amp just shines.
Click to expand...

Can you suggest Replacement for 2SJ109/2SK389 i can not get it ?
I will try, If I Can Get substitution for 2SJ109/2SK389.

I Got idea from sijosae site to make sym headamps
he modified gilmore
thisSijosae easy gilmore
 
#2,365
Sadly, there's no real replacement for those fets (which is why they're so widely used by designers). You can get some here : http://www.djgardner.com/headphone/gilmore/ (along with tons of help to build this amp).

With 8 headphone amps and going, you're gonna beat me 😉 I've had a szekeres, a ra-1 clone, a pair of pimeta and a few other 3-channels multiloop amps, a gilmore (sadly i'm gonna have to sell it along my grado sr-225), a tube amp (Audiovalve RKV) and a few other little things (opamps based). I'd like to toy this summer with the TPA6120A2. 😀
 
#2,366
MikeB, This Headamps sound very good :cheers:
it beats my soha headamps (using mullard CV4003 NOS tube, Op-amps OPA 2134PA, solen caps).
This headamps give more detail, more dynamic and more wide soundstage than my Soha.

And my Soha beat other headamps that I have 😀

Thanks you, mike

How to improve THD ?
What about adding 100nF Wima paralel with 100uF ?
 
#2,368
Ryssen said:

How much cooling do you use?
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I Use Letter L heatsink 13cm x 4cm x 1 cm , it's rather hot, but not very hot, I can touch it for long time. ( I will change with this heatsink, I think is enough)
13cm x 4cm x 4cm
 

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#2,369
dytln_02 said:
MikeB, This Headamps sound very good :cheers:
it beats my soha headamps (using mullard CV4003 NOS tube, Op-amps OPA 2134PA, solen caps).
This headamps give more detail, more dynamic and more wide soundstage than my Soha.

And my Soha beat other headamps that I have 😀

Thanks you, mike

How to improve THD ?
What about adding 100nF Wima paralel with 100uF ?
Click to expand...

Thanks for the compliments !
Why reduce thd ? it's below 0.01% at higher levels and 20khz, that should be low enough.
I skipped the 100nf paralell to the 100uf as it could ask for trouble, and as the outputstage runs ClassA the supplylines shouldn't be full of rubbish. But you can try if you hear a difference...

Ryssen said:

How much cooling do you use?
Click to expand...

Was your previous question related to the headamp ? If yes, it should be enough, i thought you refered to the poweramp.

Mike
 
#2,373
Mike,

Have you tried googling for Symasym? You are getting quite famous (OK, i honestly don't know what they are saying about the Symasym 🙂 ). Here are a few examples:

http://akustyka.info/articles.php?id=39
http://www.f-sport.cz/hifi/index.php?action=vthread&topic=682&forum=8&page=-1
http://www.hifi.co.yu/forum/viewtopic.php?p=24894&sid=5c9a8c53dc10e604c2b75d14e945eca0
http://www.lopuch.cz/klub.php?klub=high_end_projekty&to=4843
http://www.hifilehti.fi/keskustelu/tm.asp?m=56055&mpage=2
chip.co.id/forum/showthread.php?p=394622

Ok, PMA is involved in at least one of the czech forums, so maybe that doesn't count as surprising.
 
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