Found it Six-Transistor Ultra Low-Noise MC Phono Preamp
And now I see
this is a pre-pre to be placed before a MM system
There are no DC blocking capacitors on MC input stages. Input bias current is probably very high. Commercial manufacturers do not care about current flowing inside the coils of MC cartridges.
Yes, I know , I have Paradise phono. Input current trimming is a good thing. But, C-37 phono is very expensive phono preamp with perhaps 2000na of input current.
My version of Paradise, with Jung Super regulators. Noise and hum free.
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C6000 can be ordered from RS Australia for less than $0.90 each (USD, ex 10 percent Australian sales tax), less than $0.75/pc for orders over 100.
Would be nice if the MPP thread was visited by a friendly Aussie.
Single source for buyers from Europe is Odyssey Electronics in Massachusetts (small home business at 20 miles distance from Boston).
Much more expensive than RS and the shipping rate hurts the wallet.
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The Paradise is difficult to follow. This was a team efford over many years against all odds.
Bashing and trolling in no small measure.
We have a new design, the Zion.
It came about because there was a desire to make a fully balanced phono stage.
At the end it got so complex that it did not lend to a DIY version.
The circuit diagram is there though in the Zion thread.
Bashing and trolling in no small measure.
We have a new design, the Zion.
It came about because there was a desire to make a fully balanced phono stage.
At the end it got so complex that it did not lend to a DIY version.
The circuit diagram is there though in the Zion thread.
As I have published record-player-cabling-systems before I feel obliged to inform you that I did it again if you are interested have a look at this thread:
https://www.diyaudio.com/forums/analogue-source/328015-grounding-tonearm.html#post5562425
if you are interested have a look at this thread:https://www.diyaudio.com/forums/analogue-source/328015-grounding-tonearm.html#post5562425
I have not posted much here lately because a have very little time for DIY.
Just for fun I build the Renardson MC Pre-Pre, a design that is a bit similar to what QUAD did.
Unfortunately I could not make it work so far. I build several versions. All play music but it sound distorted and noisy.
I may be oscillation, on the scope the output shows spikes.
I tried to mail Mike Renardson but I can not find an email address on his site.
As far as I can tell he has not build the circuit himself so far.
Has anybody an idea what I could try to make it work ?
Just for fun I build the Renardson MC Pre-Pre, a design that is a bit similar to what QUAD did.
Unfortunately I could not make it work so far. I build several versions. All play music but it sound distorted and noisy.
I may be oscillation, on the scope the output shows spikes.
I tried to mail Mike Renardson but I can not find an email address on his site.
As far as I can tell he has not build the circuit himself so far.
Has anybody an idea what I could try to make it work ?
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Hi Joachim. It might be worth building the Quad as it is a crazy idea that works. Everything Quad made was a bit crazy, Yet Quad always seemed the quintessential English gentlemen. Quad claimed the phono stage was influences by current dumping. Douglas Self said 0.05% thd too high. If I had presented it at college I would have been told off. To define crazy the valve power amp was a longtail pair with a short tail using EF86 driving KT66. It couldn't possibly work, yet did. Quad 303 is bonkers, I love my one. Crimson being a version.
Rendardson have a very interesting single input stage for a power amplifier. He uses a NPN PNP complimentary input pair which avoids any compromise on linearity whilst allowing the simplicity of 1960s designs. He also uses feed-forward correction. As phono stages often need current, why not adapt his power amplifier?
If it were me I would use 9 V batteries at first. Yours circuit looks that it should work. You can try 47 uF on the LM317/337. It is slightly better and I never had a problem. Takes noise floor down about 2dB. After the regulator a simple resistor will do as the circuit defines a simple current source. I love LM317's. It's very hard to make them work badly except in cascade. LD1084 seems no worse!!
Rendardson have a very interesting single input stage for a power amplifier. He uses a NPN PNP complimentary input pair which avoids any compromise on linearity whilst allowing the simplicity of 1960s designs. He also uses feed-forward correction. As phono stages often need current, why not adapt his power amplifier?
If it were me I would use 9 V batteries at first. Yours circuit looks that it should work. You can try 47 uF on the LM317/337. It is slightly better and I never had a problem. Takes noise floor down about 2dB. After the regulator a simple resistor will do as the circuit defines a simple current source. I love LM317's. It's very hard to make them work badly except in cascade. LD1084 seems no worse!!