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-   -   Commercial Pre-Pre Amps for Moving Coil Cartridges (MC Head Amps) in Common Base (http://www.diyaudio.com/forums/analogue-source/217621-commercial-pre-pre-amps-moving-coil-cartridges-mc-head-amps-common-base.html)

tiefbassuebertr 9th August 2012 10:47 AM

Commercial Pre-Pre Amps for Moving Coil Cartridges (MC Head Amps) in Common Base
 
Similar threads are here:
http://www.diyaudio.com/forums/analo...-damaging.html

As I already mentioned about
http://www.diyaudio.com/forums/analo...mp-design.html
moving coil cartridges with low impedance/low output needs for best sonic performance common base input stages for the associated line head amplifiers instead such in common emmitter/source configuration like schematic from post #2 about
http://www.diyaudio.com/forums/analo...re-needed.html
and post #6 about
http://www.diyaudio.com/forums/analo...-501-mk11.html

I don't know exactly the reason therefore.
Even by John Curl's patent
Low noise amplifier
I don't find a justification.
Schematic of JC-1 you will find about
http://www.diyaudio.com/forums/pass-...arl-phono.html

Nevertheless in listening tests I got always the same results as mentioned by post #1 from the first URL above.

The common base circuit from Hiraga is a single ended version from the JC-1, but with fully symmetric power supply rails, i. e. without couple capacitor at the MC input - go to
Hiraga MC Preamp

Sonic difference between Hiraga and JC1 is extremly low, if there is a top quality shunt regulated power supply in use. This means, the AC coupled input at JC-1 provides no audible sonic loss, and thus this caps have no disadvantages.

I want to know an overview of such commercial head line amp products for moving coil cartridges (i. e. without integrated RIAA Phono MM amplifier stage).

Also of interest for me are all moving coil head amps with two different inputs as showed about the URL
THE TWO-INPUT, SINGLE-OUTPUT, DIFFERENCE AMPLIFIER
Then the user have the possibility to find out the best solution, because both common base and common emitter mode are to realize in a single device.

Thank you for your advices.

P. S.
If there informations concerning this by the URLs
http://www.diyaudio.com/forums/solid...amplifier.html
and
http://www.diyaudio.com/forums/analo...r-part-ii.html
I have no chance to find out this.

rayfutrell 10th August 2012 09:14 PM

Off topic, but thinks for the link to the John Curl patent. I thought QUAD invented that circuit for the MC preamp in the QUAD 44 and 34. Instead it was Mr. Curl's invention.
Ray

tiefbassuebertr 10th August 2012 10:34 PM

RIAA Phono Pre-Amps with integrated State of the art Current Injection technology
 
By this models with completly RIAA preamp function are already MC head amps integrated.
Means "Current Injection technology" consequently a topology in "common base" mode ??
look here:
CEC THE DRIVE | SINCE 1954
MCCI Balanced Moving Coil Phono | High End Audio Components - B.M.C. Audio

tiefbassuebertr 8th December 2012 09:30 AM

any news concerning commercial MC head amp (pre-pre) devices in common base ?

Parasonic 8th December 2012 01:14 PM

Greetings,

Don't think you posted this link, so apologies if already posted.
Article says Prof. Leach's design was copied and marketed by "Markof".

Moving Coil Cartridge Head Amps

Cheers,
Terry

tiefbassuebertr 8th December 2012 06:55 PM

Quote:

Originally Posted by Parasonic (Post 3276010)
Greetings,

Don't think you posted this link, so apologies if already posted.
Article says Prof. Leach's design was copied and marketed by "Markof".

Moving Coil Cartridge Head Amps

Cheers,
Terry

mean you this amp?
Marcof MC StepUp

Who has overtaken Markof ?

Parasonic 8th December 2012 09:38 PM

Can't really say if that is what was referred to in Mr. Leach's article. I found that article in passing, as I had been looking for information on the common base configuration in general, and saw your post, decided to link Mr. Leach's article, since he referenced commercial products based on his work. There were others Mr. Leach mentioned also----I have never heard or seen that product.

Terry

rayfutrell 10th December 2012 07:52 PM

Here is an old MC amp design. Armstrong is long out of business, but the circuit is interesting.
The Armstrong 700 Series - page 5

Ray

tiefbassuebertr 11th December 2012 09:54 AM

Quote:

Originally Posted by rayfutrell (Post 3279132)
Here is an old MC amp design. Armstrong is long out of business, but the circuit is interesting.
The Armstrong 700 Series - page 5

Ray

very interesting - thank you for this advice.


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