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Old 29th April 2012, 08:45 PM   #431
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Quote:
Originally Posted by Joachim Gerhard View Post
I am at the Fast Audio boot. You can see an interesting preamp with phono stage i designed. It has tone controls and a tube output stage.
Very good, it interests me to see it, especially ideas behind.

I thought you're more in speakers R&D, AP background.
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Old 29th April 2012, 09:00 PM   #432
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I design speakers too but that is not a big challange any more after more then 40 years. The only things that are left is radiation pattern and mechanics for me. I do more electronics now.
Yes that latfet drivers are pretty famous for good sound.
Anyway, if there is interest i can build a second amp with high current and no drivers.
This amp already feels like an old friend to me. I am totally convinced that using the output laterals as current fed back current sources is the way to go. High feedback emitter or source followers have problems to drive a complex load. See the measurements in the new Stereoplay.
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Old 29th April 2012, 09:08 PM   #433
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Quote:
Originally Posted by Joachim Gerhard View Post
I design speakers too but that is not a big challange any more after more then 40 years.
One info interests me the most. What kind of speakers has the man now, with all that experiences and background of more than 4 decades. Please say something about your favourites, ie. you listen to nowadays.

Quote:
Originally Posted by Joachim Gerhard View Post
This amp already feels like an old friend to me. I am totally convinced that using the output laterals as current fed back current sources is the way to go. High feedback emitter or source followers have problems to drive a complex load. See the measurements in the new Stereoplay.
I'll find to see that, interesting, thanks.
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Old 29th April 2012, 09:26 PM   #434
sonnya is offline sonnya  Denmark
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2SJ76 and complementary.

MOQ is 1600pcs each.

So there is enough for 800 stereo pairs

Delivery time : 20weeks

Price : ~1 - 1.5€/pcs
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Old 29th April 2012, 09:26 PM   #435
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I use high sensitive speakers at home. One is the Suesskind Sommerwind. It has a 30cm Von Langa fieldcoil in a 140 liter double wall cabinet and a special high sensitivity Mundorf AMT over 1,4 kHz. The other speaker is a G-Pole with 2 Enviee drivers and an active bass. That is an M-frame coupled to the backwall with a granite plate. I recycle the back EMF so that the bass drivers have no excess movement. I am preparing a patent.
You can see some of my setups on my MPL thread.

Last edited by Joachim Gerhard; 29th April 2012 at 09:33 PM.
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Old 29th April 2012, 09:29 PM   #436
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Here you can buy smaller quantities but more expensive.
schulelektronik.de - elektronische Bauelemente - Transistoren - IC´s - STK - Kondensatoren - Widerstände
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Old 29th April 2012, 09:33 PM   #437
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here is an example.
i also have sources in japan.
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File Type: jpg laterals.jpg (20.1 KB, 384 views)
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Old 30th April 2012, 02:37 AM   #438
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by Lazy Cat View Post
Hi Gerhard 6800 uF feedback elcos
Back to back to make up 3400uF NP. We can connect the negatives together (BP) or to connect the positive together (NP) as in Gerhard's and the sound is different. I don't know which one should go into which situation. The last time I tried BP sounded better.
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Old 30th April 2012, 07:30 AM   #439
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No, this is not bipolar but of cause a bipolar can be made that way. I connect minus to minus usually.
Cyryl Bateman found out that this gives less distortion but a "real" bipolar like Nichicon Muse ES has even lover distortion.
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Old 30th April 2012, 08:32 AM   #440
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Exclamation TSSA Basic 1.5 - Update

Hi guys

Gerhard and Sonnya (and others if any interested) please look at change in schematic. 2200 uF/10 V capacitor added to feedback bridge (from TSSA BIGBT HP and SSA experiences) for extra distortions reduction. This elco decouple middle bridge DC from any AC being present because of unsymmetry, secondly it will cause our amp to raise bias slowly from firing-up, some sort of soft starting. Since this is symmetrical design we don't want anything to spoil our little symmetrical toy.

BTW how's P2P work standing now Gerhard, do I have to wave the finish
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