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phono pre for low output MM cart?
phono pre for low output MM cart?
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Old 21st January 2021, 04:42 PM   #11
billshurv is offline billshurv  United Kingdom
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phono pre for low output MM cart?
The attached may be of interest. This is an impedance measurement of the EPC205CIIL which is a lesser cousin of the 100 but similar low output and I have no reason to believe it is hugely different in coil construction. This was something Hans Polak did on a thread where we were looking at different ways of electrically loading cartridges. The interesting part is the equivalent electrical model which may not be perfect, but is better than anything measured before.



The bottom graph shows how loading affects the cartridge, which shows is relatively insensitive to load. Sadly it's not a great candidate for current mode operation which is an interest/fetish of mine.



None of which gives the answer you want, but might inform the discussion.
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File Type: png Technics 205C-IIX-2.png (87.5 KB, 174 views)
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Old 21st January 2021, 07:20 PM   #12
MarcelvdG is offline MarcelvdG  Netherlands
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Quote:
Originally Posted by noviygera View Post
Specific question:
Would the Salas Simplistic Folded phono be a good one in this application? Discrete design.
Apparently it has a JFET input, which means its equivalent input noise current can't be excessively large, so that's good.

Its equivalent input noise voltage is low enough for moving coil, so it is definitively low enough for your cartridge.

I don't know about the input impedance and gain.

Do you have any information about whether the input impedance can be set to something in the 10 kohm to 47 kohm range? What gain does it have?
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Old 21st January 2021, 10:54 PM   #13
noviygera is offline noviygera  United States
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Salas Simplistic Folded works with MM and has adjustable gain.
Simplistic NJFET RIAA
The input impedance is 47K and can be set to any value you put on it.
Schematic is also in the post linked above.

I guess this unit will work good?
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Old 21st January 2021, 10:58 PM   #14
rayma is offline rayma  United States
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Yes, and use the 56dB setting. Input impedance range could be set from 10k to 47k.
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Old 21st January 2021, 11:00 PM   #15
MarcelvdG is offline MarcelvdG  Netherlands
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It should work very well with your cartridge. I would try 47 kohm and 56 dB gain first and adjust the gain if needed.
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Old 21st January 2021, 11:21 PM   #16
noviygera is offline noviygera  United States
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Ok, thanks guys.
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Old 22nd January 2021, 08:13 AM   #17
andyr is offline andyr  Australia
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Quote:
Originally Posted by noviygera View Post
I'd like to ask for guidance on the type of phono pre-amp for a low output MM cart.

For example: Technics EPC-100c
output 1.3mv
DC resistance: 30 ohms
inductance: 33mH
impedance: 210 ohm, 1khz

This is not a typical MM cart so I wonder if it needs an unusual phono stage? Or just any good MM phono with enough gain? How much gain?

thanks!
That's an interesting one - MM ... but low output (as distinct to being a HO MC - which typically has a similar output!).

As rayma said - any phono stage that offers 52dB of gain (so 4 times the gain of a standard MM phono stage - which expects 5mV input) will cope ... provided it has the ability to offer a high loading to the cart.

Andy
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Old 23rd January 2021, 05:26 PM   #18
NareshBrd is offline NareshBrd  India
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Click the image to open in full size.
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Old 23rd January 2021, 05:28 PM   #19
NareshBrd is offline NareshBrd  India
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Found it on my computer.
Downloaded long back
All intellectual rights acknowledged.
Its not my design.
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Old 23rd January 2021, 05:29 PM   #20
NareshBrd is offline NareshBrd  India
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Another one:Click the image to open in full size.
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