MC Preamp vs Step Up Transformer

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chip_mk

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Joined 2005
#1
There are three solutions for amplifying MC signal to line level:

1. High gain (~60dB) RIAA preamp
2. Step Up Transformer + MM input RIAA preamp
3. Same as point 2 but using electronic 20dB gain block instead of SUT

From your experience, how do you value each solution judging by final (audible) result?

Can solution 3 keep up with solution 1?
 
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#2
2 - depends on the transformer - some little ones slur - soften transients - 40 some years ago I had a Technics SUT with multiple shielding and 200KHz bandwidth - SOTA. Also, a microphonic miniature tube pre-preamp. What does ASR say regarding practical gain devices for MC cartridges ? -that would be an interesting place to post these questions.
 
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#5
HI,

I think the question is too generic as each MC cart behave a bit different and may need different solution to sound best comparing another MC. For example a Denon DL 103 it is said that sound best with a step up, but a Pre with the correct gain ( not only 60 Db but 65 or 67 Db is needed ) in my opinion may sound very good and may avoid other hum problem of the step up.
Other MC may sound only with the step up and other MC very well with a pre.

Rgds

Adelmo
 
#6
Particular case is if a DIYer has an MM phono preamp and is very pleased with it but needs a solution for his/her new MC cartridge. Which approach is most likely (least risky) to give equally great result? Build #1, buy #2 (SUT is not easy to DIY) or build #3?
 
#8
This is what I've stumbled upon on a web site of a high class SUT manufacturer:

Why You Should Have a Transformer – And Why They Are Rarely Seen​

The purpose of MCX is not simply to allow moving-coil cartridges to be used with moving-magnet phonostages (most valve designs, for example), but to allow high-output moving-coil cartridges the chance to realize their full potential. Transformers have much more benign distortion characteristics than active circuits and are capable of producing a sublime soundstage with detail and separation unsurpassed by the more common transistor and op-amp alternatives. The reason transformers are so rarely seen nowadays is because they are incredibly expensive compared to transistors and chips. A complete moving-coil phonostage is obviously more convenient than a separate transformer and moving-magnet phonostage, and a moving-coil phonostage made entirely with solid-state circuitry is considerably cheaper to produce than one with transformers.
Click to expand...

Makes sense?
 
#9
chip_mk said:
Particular case is if a DIYer has an MM phono preamp and is very pleased with it but needs a solution for his/her new MC cartridge. Which approach is most likely (least risky) to give equally great result? Build #1, buy #2 (SUT is not easy to DIY) or build #3?
Click to expand...
Hi,

The least risky is to listen in your set up before to build or to buy it. Or based in your equipment, cart, pre phono , amp, speakers and soo on ask suggestion to whom has tested something similar or have experience.

Rgds
Adelmo
 
#10
How about an transimpedance/current mode head-amp which plugs into your existing MM-stage? Often low-output MCs have plenty current, so better s/n ratio. There are some great designs on site, for sure. Higher output will do fine in several different configurations, so I agree, it depends a bit on the cart.

Dagfinn
 
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