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Old 19th August 2005, 10:22 AM   #1
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Unhappy Head-amp questions???

Hi,


I have MbQuart 450Pro dynamic headphones (300 ohm impedance) and I am looking an amplifier (looking about 1,2, i don't know how much years - a very good one) to work with them. These headphones are very good ones (used to monitor final stage of music recording in studios) but they are a little bit closed and like to have a very quick, open, with lots of air arround,spacious and dynamic amplifier.... I have made few amplifiers (some of them qrv07 (PerAnders), some opamp designs with no names, brute force in a line stage (Barbour), some 5687 tube designs,...)but none of them worked best with them (I have allways feeling that they could perform better).
I am currently listening to a qrv-07 from mr. PerAnders using opa134 and TPA6120 opamps (I will try to put OPA627 instead of OPA134). It is o.k. but too clinical and not so spacious. Everything is inside my head (not going arround it - if You know what I mean)........
I have been looking to an Borbely Tube Mosfet Opamp from Designing an Opamp Head-amp article.....Would this be the answer for me?
I would appreciate suggestions - what to do (make) since I am tired of looking..... (yes, i know that this might be painfull road)...

Suggestions what might be the solution would be helpfull - no output transformers please.....
best regards
sunny
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Old 19th August 2005, 11:41 AM   #2
SY is offline SY  United States
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I changed the title of your post to remove ambiguity- "head-amp" usually means a moving coil cartridge step-up.
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Old 19th August 2005, 11:46 AM   #3
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Quote:
Originally posted by SY
I changed the title of your post to remove ambiguity- "head-amp" usually means a moving coil cartridge step-up.

o.k.- thanks
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Old 20th August 2005, 11:10 AM   #4
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nobody?!
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Old 20th August 2005, 11:47 AM   #5
Raj1 is offline Raj1  United Kingdom
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Hi,

are opt's being rejected in terms of cost or performance?

I have sennheiser hd580's, I use an output stage using 3a5's and the sowter 8650's with tvc, the opt can drive down to 100ohms, I get quite a nice sound from this setup. Not the greatest oomph, but pretty well balanced in terms of sound. I have previously tried the wna head amp, it had more grunt, but the edge definition was sharp, and it was not quite as engaging too clinical). You might want to try posting at headwize, you'd probably get more replies as it's dedicated to headamps........


thanks
raja
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Old 20th August 2005, 11:50 AM   #6
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Have you looked at the design that Broskie has over at Tube Cad?
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Old 20th August 2005, 01:39 PM   #7
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Quote:
Originally posted by Raj1
Hi,

are opt's being rejected in terms of cost or performance?

raja
Cost is the problem - i posted there and there seems that there are not a lot people that can help me..... i postes here on tubes and after that on solid state (i hope that moderators would not be angry about that - i am very unhappy about that..... i have searched for years to shape everything and now is the bad fase....
i am fealing that i put money and time in it and after years didn't get really anything accept knowledge but the quality is not that bigger ....... so why am i putting money in it in first place - why i didn't buy something... money is the object - right -- so i am back at the beginning..... oh boy.... bad fase like i said....... will be better .... sun is still shining....

Quote:
Originally posted by SY
Have you looked at the design that Broskie has over at Tube Cad?
yes - i kind of like tubes better.... but wouldn't say that i would use them before everything.... still i would like to use what is better.....
i didn't tried anything from there .... i don't know how good this stuff there is since mr. broskie (like he said once i belive) has a very broad view on things - so i don't know if his projects are a middle fase... i like a complete prject that is working like hell.... i am working on a aikido from his site right now (had problems with 6n6p tubes.... one bad and two destroyed because of the low Ucf - mine was to high (120V and tube specs are 100V) - didn't saw that one comin' .... maybe i should try some of his ideas...... suggestions would be great.....
thanks guys for reading this till the end..... i needed it....
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Old 20th August 2005, 01:54 PM   #8
SY is offline SY  United States
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The Broskie design ended up being a collaborative effort between him, Alex Cavalli, and Morgan Jones. I haven't used it, but knowing those guys and their work, I think you could feel quite confident that you'll be happy with it.
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Old 20th August 2005, 02:06 PM   #9
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o.k. thanks SY - so -
question - could someone that has build some heaphone amplifier from mr. Broskie and use it with headphones arround 300R or more suggest me what to do and how does it sound at his place with his headphones... i would be very gratefull....
best regards
sunny
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Old 21st August 2005, 09:41 PM   #10
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Perhaps with such a specific question you should have a look at the Headwize site?
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