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Old 13th August 2012, 03:13 PM   #6711
pdul is offline pdul  Denmark
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isnt the opamp for servo suppose to be as low offset as possiple like for an example AD711 ?
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Old 13th August 2012, 03:14 PM   #6712
MiiB is online now MiiB  Denmark
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Stefano.. please don't be such a wise guy...
I have built 3 different versions of this circuit, I have developed most of it after Joachim's intial concept... I can asure you that i works in at totally different manner than most other circuits. primarily because the RIAA is a shunt and works in parallel to the signal and not as ordinary circuits in series with the signal.. because of that what we're seeking it also different. So unless you have tried this circuit, don't be so sure you're statements are valid..
A also the servo works different compared to normal servos as its integrated in the main CCS delivering current to the system.. The servo has less influence than the resistor setting the current.

Last edited by MiiB; 13th August 2012 at 03:20 PM.
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Old 13th August 2012, 03:18 PM   #6713
MiiB is online now MiiB  Denmark
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bksabath...

some like this.. Cost you an arm and a leg though...

http://www.vishaypg.com/docs/63140/var.pdf
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Old 13th August 2012, 03:22 PM   #6714
pdul is offline pdul  Denmark
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The link is not working with a smilie in the middle
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Old 13th August 2012, 03:23 PM   #6715
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Quote:
Originally Posted by Bksabath View Post
NOW THIS make loads of sense to me

Some like this ? http://docs-europe.electrocomponents...6b800a602a.pdf
Never seen those, anyway, they have high TC so I wouldn't use them on a high gain circuit.
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Old 13th August 2012, 03:46 PM   #6716
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Quote:
Originally Posted by MiiB View Post
bksabath...

some like this.. Cost you an arm and a leg though...

http://www.vishaypg.com/docs/63140/var.pdf
Yes just the ones I was dreaming about (no kiding ask Brian)
they make same with coating so they don't breack as easy

Big question is still where?
The 33 R on the imputs Most probably
The 120 on the mirrors Maybe.

Now considering that Just the 16 for the imputs cost more than my cartridge which cost more than my arm and TT combined this need same serious consideration
(how much screaming can I take if she finds out and is it worth it?)

would same similar at half the price or a quarter go hand in hand with diminishing return?
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Old 13th August 2012, 03:49 PM   #6717
pdul is offline pdul  Denmark
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I have now tested 200 each of BC327/337-40, and i found a lot of matces in each group,
but not one useable npn/pnp pair
All Fairchild-40.
BC327 hfe 300-390
BC337 hfe 460-590
I wonder how many i have to buy to get my first reasonable pair
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Old 13th August 2012, 03:52 PM   #6718
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Quote:
Originally Posted by MiiB View Post
bksabath...

some like this.. Cost you an arm and a leg though...

http://www.vishaypg.com/docs/63140/var.pdf
I would even consider the lower end Naked TX2352 they run 1t $6-$8 each but in the right spot they can make the difference.
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Old 13th August 2012, 03:59 PM   #6719
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Quote:
Originally Posted by MiiB View Post
Stefano.. please don't be such a wise guy...
I have built 3 different versions of this circuit, I have developed most of it after Joachim's intial concept... I can asure you that i works in at totally different manner than most other circuits. primarily because the RIAA is a shunt and works in parallel to the signal and not as ordinary circuits in series with the signal.. because of that what we're seeking it also different. So unless you have tried this circuit, don't be so sure you're statements are valid..
A also the servo works different compared to normal servos as its integrated in the main CCS delivering current to the system.. The servo has less influence than the resistor setting the current.
woo woo....let's take it easy please
I asked you a simple question:
have YOU tried different quality capacitors and resistors to assure that your statement is correct?

I understand it works totally different but have you tried it?
You can have the equation of how it works but you don't have the equation of that equates to the final sound quality.

At the end I am sure you are right.
I try a lot of things anyways although solution seems to be obvious, and quite a few time I have been proved wrong thus I have learned not to be sure of things that I can't prove with a clear equation.
That is the interesting part of the development of an audio circuit.
The ear is your final judge and unless this is not fully understood, we will see commercial product going around for a lot of $$ which sound is not cutting edge.
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Old 13th August 2012, 04:05 PM   #6720
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Quote:
Originally Posted by Bksabath View Post
Yes just the ones I was dreaming about (no kiding ask Brian)
they make same with coating so they don't breack as easy

Big question is still where?
The 33 R on the imputs Most probably
The 120 on the mirrors Maybe.

Now considering that Just the 16 for the imputs cost more than my cartridge which cost more than my arm and TT combined this need same serious consideration
(how much screaming can I take if she finds out and is it worth it?)

would same similar at half the price or a quarter go hand in hand with diminishing return?
What cartridge/turntable/arm do you have?
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