okay, understood that.
5mA would be 250R at R9, right?
Do you think +/- 12V at c of bjt´s
would be fine?
5mA would be 250R at R9, right?
Do you think +/- 12V at c of bjt´s
would be fine?
That photo is from when Putin visited, so he could be cuing up a CD for ''civilized'' background listening. Notice his 100dB wolf in sheep's clothing refrigerator cabinets with pro units and compression drivers non the less. He is a Rock fan. He even has an open reel to reel and a collection of original tapes, rare vinyl, etc. Having a medium range Naim CDP when he was Gazprom chairman rather tells digital is a secondary source to him.
So he likes English culture. Me too. I really enjoyed my time at Essex to work with Prof.Hawksford and working with Be Yamamura and Robert Churchill later in the 90th. By the way over at the High Resolution Forum we are discussing Bob Katz third Hypothesis if high resolution is necessary for recording but downsampling correctly to 16/44 is sufficient for listening.
Joachim,
I hadn't looked at your posts for a few years it turns out.
I scanned most of this thread.
I am very tired now.
And I didn't even have to do any of the work!
Now that you have tried almost every RIAA circuit known to man - well not really - what have you decided subjectively??
Is it all just different?
All just the same more or less?
Does it matter what you use if it is optimized?
How much coffee or prescription medications are you on?
How many hours do you sleep a night?
Are you a vampire?
How do you get people and outside influences to leave you alone long enough to get all these things designed, built & tested?
What's your favorite color?
do you like puppy dogs?
cats?
Race cars?
From where comes your energy and enthusiasm to do all this?
Are you crazy?
😀
_-_-bear
I hadn't looked at your posts for a few years it turns out.
I scanned most of this thread.
I am very tired now.
And I didn't even have to do any of the work!
Now that you have tried almost every RIAA circuit known to man - well not really - what have you decided subjectively??
Is it all just different?
All just the same more or less?
Does it matter what you use if it is optimized?
How much coffee or prescription medications are you on?
How many hours do you sleep a night?
Are you a vampire?
How do you get people and outside influences to leave you alone long enough to get all these things designed, built & tested?
What's your favorite color?
do you like puppy dogs?
cats?
Race cars?
From where comes your energy and enthusiasm to do all this?
Are you crazy?
😀
_-_-bear
Last edited:
If i would be crazy the circuits would not work but the ones i designed to the end do.
Concerning the seemingly endless energy i have my "secret" is a rather unusual schedule.
Usually i sleep two times a day. Maybe 2 hours in the late afternoon or evening. Then 6 hours from maybe 3.00 - 6.00 after midnight to 9.00 - 13.00 the same day. When i am very tired i am able to "switch off" the eyes and my ears and take small naps of maybe 10
to 20 minutes. That is even possible in high noise environments. I learned this during the 90th when i traveled the globe tireless, left and right. I eat and drink as good stuff as i can. We cook a lot at home. Basically mediterranean and japanese but also what we call "new light german". I smoke too much and one of my projects this year is to stop. I was a violent non smoker for 20 years but i have picked it up maybe 5 years ago.
Coming back to the circuits i tested, i found that you can make a lot of topologies sound good when they do the job correctly. It all depends on how you build it and what parts you use in combination. PSU is important etc. A stage i would build for me would be typical parallel symmetric, cascoded, fast and precise current mirrors. 75usec transimpedance and 318usec and 3180usec active. DC coupled, well buffered.
Concerning the seemingly endless energy i have my "secret" is a rather unusual schedule.
Usually i sleep two times a day. Maybe 2 hours in the late afternoon or evening. Then 6 hours from maybe 3.00 - 6.00 after midnight to 9.00 - 13.00 the same day. When i am very tired i am able to "switch off" the eyes and my ears and take small naps of maybe 10
to 20 minutes. That is even possible in high noise environments. I learned this during the 90th when i traveled the globe tireless, left and right. I eat and drink as good stuff as i can. We cook a lot at home. Basically mediterranean and japanese but also what we call "new light german". I smoke too much and one of my projects this year is to stop. I was a violent non smoker for 20 years but i have picked it up maybe 5 years ago.
Coming back to the circuits i tested, i found that you can make a lot of topologies sound good when they do the job correctly. It all depends on how you build it and what parts you use in combination. PSU is important etc. A stage i would build for me would be typical parallel symmetric, cascoded, fast and precise current mirrors. 75usec transimpedance and 318usec and 3180usec active. DC coupled, well buffered.
For a circuit i like see Rüdigers post 2056. That could be the input stage. The current mirror can be improves and you could build it unbalanced for 3dB less noise. The 75usec could be made with a cap parallel to the output resistor ( transimpedance ). That has the advantage that clicks and pops do not reach the second stage. I would not hesitate to do the second stage with Opamps. At that level they can be very good. For example LME49990 buffered with LME49600. That drives the 318usec and 3180usec part active. I would add a servo to that stage. PSU is another matter all together. I am quite a fan of passive or low feedback solutions. A shunt can behave quite temperamental but i am not strictly against it. Double mono was always better in my listening tests. More separation and dimensionality.
Off topic maybe.. but would it not resistor vise be an advantage to go to SMD types...layout can be tighter and..and stray inductance/capacitance minimized...
don't know if the good types are cheaper in SMD....
don't know if the good types are cheaper in SMD....
power rating + tempco can be a "problem" for ultimate linearity in smd
NiCr and TaN can be had in smd, possibly the premium is slighty less than thru hole
nobody's giving away bulk metal foil resistors
NiCr and TaN can be had in smd, possibly the premium is slighty less than thru hole
nobody's giving away bulk metal foil resistors
Depends on the value, last time i checked.
Rather expensive parts for a volume attenuator, think +$1k total for a stereo balanced setup > http://www.diyaudio.com/forums/atta...d1184315011-diy-solid-state-preamp-volume.jpg
(still much less costly than VSM/VSMP/VFCP)
Rather expensive parts for a volume attenuator, think +$1k total for a stereo balanced setup > http://www.diyaudio.com/forums/atta...d1184315011-diy-solid-state-preamp-volume.jpg
(still much less costly than VSM/VSMP/VFCP)
When going to SMD i would prefer thin film over thick film and use the biggest case i can get. Some like Melf resistors. I used them in Adyton preamps of the early 90th ( we where the first using SMD in HiFi i think ) and they sounded very good.
Them MMB-types from Vishay looks quite nice. for lower ohmic values they also exit in an RF version with low inductance... Noise figures are quite low as well...and cost....app 10 cent's 🙂 thanks