Jan,
I already posted the answer and it is quite new and insightful, but it seems very few understood it. So I am trying to build the basis for what is going on by looking at the personality and how that is expressed in circuit topology and the reasons why.
I am asking simple questions and getting two classes of answers, nonsense from those who will later claim the work he is doing is old and those who might be interested but aren't sure of the direction.
I would like some of those folks who contact me privately to post and become more active. If enough do that it may drown out the naysayers and allow JC to show a bit more.
Now for the folks actually following, IC's have usually offered inferior results, but JC may actually be on to one of the reasons.
Now since phono preamps have at least been mentioned, let us look at the parameters that govern the design.
What is the output level required of a phono stage? (Hint typical and peak voltage and current.)
What is the input level for the preamp? (Hint source impedance, typical voltage level, peak voltage level using the entire commercial range of cartridges.)
(George your on!)
I already posted the answer and it is quite new and insightful, but it seems very few understood it. So I am trying to build the basis for what is going on by looking at the personality and how that is expressed in circuit topology and the reasons why.
I am asking simple questions and getting two classes of answers, nonsense from those who will later claim the work he is doing is old and those who might be interested but aren't sure of the direction.
I would like some of those folks who contact me privately to post and become more active. If enough do that it may drown out the naysayers and allow JC to show a bit more.
Now for the folks actually following, IC's have usually offered inferior results, but JC may actually be on to one of the reasons.
Now since phono preamps have at least been mentioned, let us look at the parameters that govern the design.
What is the output level required of a phono stage? (Hint typical and peak voltage and current.)
What is the input level for the preamp? (Hint source impedance, typical voltage level, peak voltage level using the entire commercial range of cartridges.)
(George your on!)
I never told you, so I can't remind you.
I have no doubt op amps turn up just about everywhere, and that even statistically must include the High End. The Good Lord knows one has one's selection these days, from both several sources and at a range of prices.
Nevertheless, according to my experience, ALL of the best sounding gear I have heard to date was generally based on discrete technology, even if some parts (usually tone controls) did use op amps. I wouldn't know about that, I just press the "bypass", or "defeat", or some such switch and leave it at that.
The one exception to this is the Karan, which makes extensive use of op amps, as it is based on Burr-Brown products. Only the driver and output stage are discrete.
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I am to assume that the last comment from John is for a class D amplifier from the Hypex comment? How is that not an IC based product? \\
As far as vacuum tubes, do we really have to go back to rolling tubes and all the nonsense with available quality tubes? I wouldn't care if the things sound great, I am never again going to own another vacuum tube amplifier, never. I do however have an old Mac tube tuner that I have hung on to, it just works great.
As far as vacuum tubes, do we really have to go back to rolling tubes and all the nonsense with available quality tubes? I wouldn't care if the things sound great, I am never again going to own another vacuum tube amplifier, never. I do however have an old Mac tube tuner that I have hung on to, it just works great.
George is a very common name but in case you address me Ed, I will respond to the honour.
IMO, JC is never hindered to show “a bit more” circuit design here, he is encouraged to.
It is his choice to bring back a BB argument from time to time just to start a flame war intentionally.
He is not heart from this, don’t worry. It’s just intention seeking.
I belong to the mortals who intend to enjoy through diy equipment the playback of music.
I’ve said again that the game for me is proper implementation, not advanced schematics.
As such, ICs can be more than adequate (*), I just have to look for gross specifications that matter in every specific case.
And of course attention to PSUs.
“Parameters that govern a phono preamp design”?
I would only look for ample overload margin on every stage and input RF immunity.
The other parameters that usually seek all the attention (noise, RIAA accuracy, IMD, channel separation) are really plagued by the vinyl software (the medium is orders of magnitude worse that a humble preamplifier).
George
* If you can bear this, I live with ridiculous class D ICs for some years now
Yes George I mean you.
In order to design for ample headroom, we should know what voltage to expect from a phono cartridge. A Shure V15 type 4 can produce 42 mV at 1000Hz before mistracking! That is also the 0 db gain point for RIAA equalization. But before equalization what is the maximum really expect?
What voltage can we get from a moving coil cartridge?
In order to design for ample headroom, we should know what voltage to expect from a phono cartridge. A Shure V15 type 4 can produce 42 mV at 1000Hz before mistracking! That is also the 0 db gain point for RIAA equalization. But before equalization what is the maximum really expect?
What voltage can we get from a moving coil cartridge?
No A.Wayne,
I actually think you are. I haven't seen any designs by John of tube pre's or amps and I doubt highly that he will go in that direction at this time. He might throw in the occasional comment that tubes are better but that is about it. You belong over with the Cary amps and such, you can have all the room heaters you want. I have had Mac equipment and others and I'm not interested. Funny I never see you ask any questions, just snide remarks wherever you post.
I actually think you are. I haven't seen any designs by John of tube pre's or amps and I doubt highly that he will go in that direction at this time. He might throw in the occasional comment that tubes are better but that is about it. You belong over with the Cary amps and such, you can have all the room heaters you want. I have had Mac equipment and others and I'm not interested. Funny I never see you ask any questions, just snide remarks wherever you post.
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