Commercial Pre-Pre Amps for Moving Coil Cartridges (MC Head Amps) in Common Base - diyAudio
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Old 9th August 2012, 09:47 AM   #1
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Default Commercial Pre-Pre Amps for Moving Coil Cartridges (MC Head Amps) in Common Base

Similar threads are here:
DC Coupling for MC Cartridges - how much error voltage before coil damaging

As I already mentioned about
Another Discrete BJT MC Preamp Design
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
Design for a special MC Prepre needed
and post #6 about
MC pre pre amp for shelter 501 MK11

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
Better MC Pre-Pre solution for low internal coil resistance- not only for Pearl phono

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
John Curl's Blowtorch preamplifier
and
http://www.diyaudio.com/forums/analo...r-part-ii.html
I have no chance to find out this.

Last edited by tiefbassuebertr; 9th August 2012 at 09:56 AM.
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Old 10th August 2012, 08:14 PM   #2
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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
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Old 10th August 2012, 09:34 PM   #3
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Default 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
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Old 8th December 2012, 08:30 AM   #4
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any news concerning commercial MC head amp (pre-pre) devices in common base ?
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Old 8th December 2012, 12:14 PM   #5
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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
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Old 8th December 2012, 05:55 PM   #6
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Quote:
Originally Posted by Parasonic View Post
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 ?
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Old 8th December 2012, 08:38 PM   #7
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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
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Old 10th December 2012, 06:52 PM   #8
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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
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Old 11th December 2012, 08:54 AM   #9
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Quote:
Originally Posted by rayfutrell View Post
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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