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Old 6th November 2005, 10:20 AM   #131
promitheus is offline promitheus  Europe
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Tarasque you are right.
I didnt see that xavier1000 meant amplifiers in parallel.
I was thinking of the option to use 2 stages one after the other which is a different thing.
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Old 6th November 2005, 11:41 AM   #132
analogair is offline analogair  Denmark
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Default Raising the Gain of the Pearl for MC Cartridge's...

Raising the gain in any way, will in theory raise the noise floor as well and S/N Ratio will be lowered, but isnt' it so on all MC phono preamps compared to the same preamp as an MM phono preamp.

promitheus has an really good aproach by means of an MC Transformer, but an really good one is usually very expencive

Paralleling Stages as posted by Tarasque, might work ?, but is, in my opinion, a expencive solution as well.

Additional jFets in parallel. This could be a suitable solution, but as pointed out, which problems are we facing other than the hard time matching more than 4 jfet's, ohh my what a pool we need ( for 16 matched transistors (2 x 8)).
Further more we then have to think about the jFet's caracteristics if we match more than the 4 pr channel.

Perhaps just my humble opinion, but have given this issue alot of thaught, and i think the best solution might be to build the ONO's MC stage, and ad it to the Pearl's input, with some sort of selector for MM and MC.

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Old 6th November 2005, 11:50 AM   #133
promitheus is offline promitheus  Europe
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I dont think a high end aproach like using a Lundahl Tranformer is so expensive.
it only costs 100 Euro for 2 pieces and you dont have any problems.
Or just use a better MM catridge.
If you invest the whole work and the costs of making a better MC stage just use a better MM.
An expensive MM can play better than a cheap MC.
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Old 6th November 2005, 12:07 PM   #134
analogair is offline analogair  Denmark
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Default Raising the Gain of the Pearl for MC Cartridge's...

Yes, but we must also take in consideration the fun of building the darn thing by our self promitheus.
I would like to build the MC stage of the ONO, and add it to the Pearl. My only prob. is that i'm not familiar with doing PCB layout.
Anyone Anyone up for it ?
http://www.passlabs.com/downloads/ol.../aonoserv0.pdf
Page 5 of 9


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Old 6th November 2005, 12:14 PM   #135
promitheus is offline promitheus  Europe
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well if more people were interested I could do it.
Maybe with a few extra options like dip switch for changing input resistor or changing the gain.
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Old 6th November 2005, 12:40 PM   #136
analogair is offline analogair  Denmark
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Default Raising the Gain of the Pearl for MC Cartridge's...

Yeah, you've got the spirit promitheus

Like in the ONO's MC input ?

Gain short for -4dB and -10dB and The Resistive load of the MC Cartridge.

? one could bring it to the front of the Chassis of the Pearl, would be nice.

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Old 7th November 2005, 06:20 PM   #137
promitheus is offline promitheus  Europe
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Is anybody else interested in an MC preamp for the Pearl?
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Old 7th November 2005, 06:29 PM   #138
Tarasque is offline Tarasque  Netherlands
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Default MC head amp

all,

Heaave a look at the MC head amps as published by Leach.
These are very simple, well performing and low noise options that only takes 3 - 5 transistors to make. This is also cheap enough to do some experimentation if it works for your cartridge.
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Old 7th November 2005, 09:24 PM   #139
FrankDIY is offline FrankDIY  Canada
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Quote:
Originally posted by promitheus
Is anybody else interested in an MC preamp for the Pearl?

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Old 8th November 2005, 04:02 AM   #140
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Default I'm using the Pearl and the Lundahl....

transformers now along with the Denon DL-103R. Its an excellent combination, IMHO.

While I've thought about an active stage of gain much like Wayne discusses in the Pearl documentation, I've not been too motivated to make any changes to the Pearl's boards.

Currently, I have step-up transformers in a separate case with their own loading resistors so that I can remove it from the audio chain quickly when I switch pre-amps around or swap cartridges.

I actually prefer this Pearl/Denon pairing with the Pearl over the tube phono preamp sections in my McIntosh MX-110 or the Mac C2200 preamp.

Cheers,

David
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