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Old 13th July 2012, 01:48 PM   #6211
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The Denon DL103R with 14 Ohm should work somewhat better. Also all Lyras and most Ortofons.
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Old 13th July 2012, 01:50 PM   #6212
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Here is a list of the Benz cartridges :Benz-Micro Cartridge Specs & Prices

The ones under 20 Ohm should work fine.
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Old 13th July 2012, 01:53 PM   #6213
RCruz is offline RCruz  Switzerland
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I see the dl103 has about 40ohm output imp. Maybe that is why my offset does not reach zero.

Hope it does not affect sound in any way.
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Old 13th July 2012, 02:01 PM   #6214
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Simply put a 40 Ohm resistor parallel to the input ( without cartridge connected ) and then you see. The last time i measured a Denon DL103 it had 28 Ohm but 40 Ohm are shown in the data sheet.
There is a website called Vinyl Engine:Technics | Cartridge Data | Vinyl Engine
There you can see at lot of information.
I heard good things about the Technics MCs from the 70th and 80th. Pristine examples you can find on e-bay and others for 100 - 200 $.
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Old 13th July 2012, 02:05 PM   #6215
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I know Cartridge Database.... that is where I found the dl103 info thank you for the Technics tip. I will search one of those.
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Old 13th July 2012, 02:11 PM   #6216
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As i reported some time ago input offset pushes the cantilever of the cartridge a bit out of the middle point of the magnet system. That can be partly compensated with down pressure. I found that under 0.1mV it does no harm. You can of cause use a capacitor at the input.
Say you load the input with 10kOhm. Then a 220uF elcap is fine.
You can also use an oversized one in bipolar plus a foil shunt, say a 1000uF 25V Nichicon ES with 1uF shunt.
I do not say that this is the most elegant solution but there will not be much distortion with the elcap because of such low level. This gives you at least the possibility to check out if the little offset there will remain does harm or not in terms of sound.
Frying the cartridge is unlikely. I build a lot of transimpedance inputs with much more offset and never destroyed a cartridge.
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Old 13th July 2012, 02:33 PM   #6217
RCruz is offline RCruz  Switzerland
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A friend of mine wants to have a listen to the paradise with a bluenote boboli.

I guess this cart should have around 150ohm output imp.

What should I espect in terms of sound results ?
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Old 13th July 2012, 03:01 PM   #6218
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As far as i can tell the Boboli has 1.5mV nominal output. Plus 20dB can be cut at certain frequencies so it will put out 15mV on the highest peaks. Say we have 60dB of gain, we end up with 15 V at the output ! The Paradise can throw 15V P-P so on the highest peaks it will just not overload but you end up with a lot of voltage before the preamp. The 150 Ohm may certainly need a coupling cap.
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Old 13th July 2012, 07:57 PM   #6219
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Benedetto View Post
Ouch.
What happened to our dutch connection ?
Stuffing german highways with these cute little boxes
they use to attach in the back of their cars ?
He was away for a short 'away mission' but he's back. Some mail has to be answered, and that will be done during the weekend.

I see that here all is well, all constructed power supplies are working as expected, and function in one go. As are the P2's, well done! Also I see some very promising listening reports, I cannot wait to hear it myself (and maybe even compare it to my Balanced input all DC coupled RIAA preamp).

On this front here (you know I did show the boards some weeks ago), all parts have arrived, and my frame/chassis builder has delivered the first (beta) chassis. So I have to start building... BTW the top/back/internal-enclosure plates will be copper plated-polished-lacquered
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Old 13th July 2012, 08:00 PM   #6220
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Your PSU design for the Paradise R2 is rock solid.
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