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Old 7th December 2012, 08:37 AM   #351
oz7aff is offline oz7aff  Denmark
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Ok, I dont't know the Objective2 headphone amp, but I still misses to see IC based phone amps that can drive my phones. If it is solid state we are talking, my favorite is this one http://www.sandcastle.dk/artikler/HP%20Amp.pdf
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Old 7th December 2012, 09:56 AM   #352
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Quote:
Originally Posted by bkercso View Post
I would choose this all poor discete JLH. The sound of this amp is smooth, slow a little bit, relaxed but precise enough. Don't coloring hard. I didn't hear the O2 but I heard the JRC4558: musical, precise, faster than JLH. But IC-like, discrete is better for me, sound of the JLH is more clear. I think if you choose faster transistors instead of TIP41 the amp will faster sounding (maybe MJE243 will be good but the pinout is reversed, see the datasheet!).
So you mean this amp has "tube like" smooth sound, while the other sounds colder but, more detailed?

My headphones are AKG K240M 600ohm, 88db/mW sensitivity. I would like the amp to work with all my future headphones as well, such as low-Z iems.

I think I will build the O2 for now, and maybe JLH later to compare. Thanks
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Old 7th December 2012, 02:13 PM   #353
oz7aff is offline oz7aff  Denmark
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I will try to go the other way. I think I will try building the JLH HP Amp with some old 2N3054 I have in stock.
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Old 7th December 2012, 05:50 PM   #354
bkercso is offline bkercso  Hungary
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My favorite is CKKIII (with BJT input), but "HP Amp.pdf" linked above is almost same sounding, very good too (I built all the 3)!
JLH is cleaner than tube amps I heard before.

Last edited by bkercso; 7th December 2012 at 05:55 PM.
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Old 7th December 2012, 07:26 PM   #355
oz7aff is offline oz7aff  Denmark
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That CKKIII amp look's very interesting, and the PCB is low priced so I might have a go at it just to try that out to. Is there anywhere one can see the schematic ?
My tube hp amp is sounding very clean and have a nice sound to it, one has a tendency to play very loud with that amp. http://www.sandcastle.dk/artikler/TUBEHPAMP.pdf
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Old 7th December 2012, 08:37 PM   #356
bkercso is offline bkercso  Hungary
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You can find a 'Schematic' menu point at the left side on The Cavalli-Kan Kumisa III Stereo Headphone Amplifier
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Old 7th December 2012, 08:47 PM   #357
oz7aff is offline oz7aff  Denmark
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Quote:
Originally Posted by bkercso View Post
You can find a 'Schematic' menu point at the left side on The Cavalli-Kan Kumisa III Stereo Headphone Amplifier
I had found them, but thank's for the info anyway.
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Old 8th December 2012, 10:02 AM   #358
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I changed the pot. volume of my JHL for an ALPS (50K). I prefer this pot. at to original "Step-to-step".
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Old 8th December 2012, 02:18 PM   #359
oz7aff is offline oz7aff  Denmark
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I can understand that, I also prefere the no-click version, but at the time it was the only one in my stock
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Old 8th December 2012, 09:47 PM   #360
oz7aff is offline oz7aff  Denmark
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I have build for the fun of it a small portable class D amplifier witk built in accumulator and charger http://www.sandcastle.dk/artikler/ClassD01.JPG http://www.sandcastle.dk/artikler/ClassD02.JPG

Now I am thinking of doing something similar with a headphone amplifier, could be a very nice portable unit together with at good portable player.

Does anybody have tried this before, and can supply with some hints ?
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