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Old 6th February 2011, 02:59 AM   #2091
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Well the Helikon SL is very good to test your phono amps for low noise because of the low output. Usually when they come back from Mishima they sound better then they ever had because he puts in all his new knowlage on the way. My Titan i after refurbish sounds much better then it ever had. Concerning income mine is 1/10th then i made in the 90th when i sold speakers by the truckload. Yes, this High End busyness got tough so i am quite displeased that people like us that really try to improve sound get more often acused to be greedy. Anyway, i am a more happy person then i was 10years ago traveling the globe without rest and no time to develop.
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Old 10th February 2011, 08:32 PM   #2092
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Default erleben

Deeply impressed through the words of your last post.

My diy friend Klaus and me
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Old 10th February 2011, 09:04 PM   #2093
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Klaus and me re-experience diy in the moment. We are getting inspired from the ideas and designs that are posted by you, Joachim .

My little diy career started in autum 89, when I received my first issue of Audio Amateur.

Ups and downs, enthusiasm, dissapointment and lack of interest, came up and left through the last 20 years.

diyaudio.com, the german AAA forum, and the small frickelfest.com side are my favorites, but all of diy audio lives from people like Papa, ZenMod, John Curl,
syn08, Joachim Gerhard, Juma, AndrewT, Scott Wurzer, always online Salas, Planet10, etc. etc.

Thanks to all the people who are contributing, and thanks to all the people who are participating. To all the people who organize GB, simulations, etc. etc.

Welcome back Joachim, and stay!
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Old 10th February 2011, 10:35 PM   #2094
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Thanks Sam. See you on saturday and i bring a phonostage with my own PSU. The PSU is rather simple but works to my satisfaction. For me it sounds better then lead acid batteries even when i buffer them with RC filters and common mode chokes.
It will be intersting to listen to your 3 versions of the FF2010 lineamp. Thanks that you did not give up on this.
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Old 21st February 2011, 03:34 AM   #2095
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I am currently working on a new high speed headphone amp that can also drive high effiency loodspeakers or computer monitors. But first see this nice historical video of the making of the RCA Living Stereo records.
Sound And The Story : Handy (Jam) Organization : Free Download & Streaming : Internet Archive
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Old 21st February 2011, 04:52 PM   #2096
masag1 is offline masag1  Germany
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Thanks for the link above.

Burning a CD at home, is a little bit easier, as pressing some black vinyl records

So, what about your Headphone amp?

Regards

Sam
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Old 21st February 2011, 05:45 PM   #2097
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Yes, they did a major efford in 1956. I was born in 1957, so right at the start of the commercial available stereo record. No wounder i am so attracted by vinyl.
I have made a basic circuit for my new headphone amp. My old headphone amp was published here. It is basically an input buffer, an inverting Opamp and a diamond buffer at the output. I published it here some time ago. I sounds good but i miss something. It could sound more dramatic and with more slam although i run it in class A with more the 50mA standing current. Actually my AKG K701 is not an easy load at all. I also miss the last bit in treble resolution. It came already clear to me that the diomond buffer can be aproved on. First i made a Fet-Bipolar buffer and then the Fet-Hawksford-Cascode buffer and both sounded better then the diamond buffer. I think with the Hawksford buffer i reached my nirvana so far. ( is there any intermediate nirvana ? ).
What i trying now is a circuit i found in Tietze-Schenk 6. edition, page 508. Thanks to AS audio to send me this historic sample. It is called " Breitband-Leistungsverstärker". In english that translates into "Wideband-Poweramplifier". The idea is a work of genius i thing and very advanced for the time of publishing in 1983. There is an low frequency path and there is a high frequency path. The low frequency path goes over an Opamp and the high frequency path goes over a discrete folded cacode amplifier. At the output is a parallel symmetric emitter follower and the gain is controled with the Opamp in shunt feedback. The disadvantage is a quite low input impedance if you want the lowest noise so when your driving CD player or vinyl playback system can not drive say 2kOhm an input buffer is needed. That could of cause be the Hawksford. I will publish the fundamental circuit in some hours. It is still an alpha so i did not build it so far and component values are not all dimensioned and may change in value.
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Old 21st February 2011, 07:45 PM   #2098
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Here is the concept of the BLV ( Breitband-Leistungs-Verstärker). Let´s see out of what black hole somebody comes that has invented it and has all this done before. (:
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File Type: pdf BLV 1.0.TSC - TINA.pdf (63.0 KB, 115 views)
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Old 21st February 2011, 08:15 PM   #2099
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Originally Posted by Joachim Gerhard View Post
Here is the concept of the BLV ( Breitband-Leistungs-Verstärker). Let´s see out of what black hole somebody comes that has invented it and has all this done before. (:
Feedbeside amplifier?

US patent 4,132,958

jan didden
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Old 21st February 2011, 08:24 PM   #2100
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Party pooper.

The schematic from Titzie & Schenkelein.
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