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Old 1st July 2014, 07:49 PM   #11
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Quote:
Originally Posted by Mooly View Post
OK, got it to work.
I added the MJE340C to the library by just copy and pasting the text from Bobs notepad file into the "standard bjt" file.
To get it to save in W8.1 I had to right click the "standard bjt" file and change the permissions to allow full control. This is where different PC's might be different.
Hi and good evening !
Yes i follow the first method and i can get the Cordell bjts inside the schema
Thank you !
I think that at this point i have enough stuff to study for the next 6 months
I will start copying and simulating some circuits of preamp/amp to get used with the commands
Again about models it would be very nice that manufacturers provide them as they provide datasheet
Anyway i take the opportunity to thank you again for the exceptional and decisive support
Kindest regards, gino
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Old 1st July 2014, 08:01 PM   #12
Mooly is offline Mooly  United Kingdom
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6 months (lol) And the rest

If its any help, here is a list of some models from Linear technology. Its only a notepad file but its over the forum limit so that's why its zipped.

If you want a few LT spice circuits to play with then just say so and I'll upload them. And there are a few examples in the LT program files if you have a look.
Attached Files
File Type: zip LT Models.zip (81.5 KB, 14 views)
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Old 1st July 2014, 08:59 PM   #13
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Originally Posted by Mooly View Post
6 months (lol) And the rest
If its any help, here is a list of some models from Linear technology. Its only a notepad file but its over the forum limit so that's why its zipped.
If you want a few LT spice circuits to play with then just say so and I'll upload them. And there are a few examples in the LT program files if you have a look.
Hi and thank you very much for the models again and for your very kind offer of help
but i really think that i should give a look at Cordell's book first
I hope it will be useful at least for the english
I need to try at least to catch the very basic just to hope to ask some reasonable question.
I will read the book first .. it should arrive soon.
Thanks again, gino
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Old 2nd July 2014, 06:56 AM   #14
Mooly is offline Mooly  United Kingdom
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OK
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Old 2nd July 2014, 10:40 PM   #15
kouiky is offline kouiky  United States
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Does the library include jfet models, by chance?
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Old 3rd July 2014, 06:37 AM   #16
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Originally Posted by Mooly View Post
OK
Good morning MR Mooly
its me again ... sorry

Just one question ... in the waiting for the book
I am focused now on the very very basic circuit ... the one depicted here below

Click the image to open in full size.

just to try to understand the effects of changing the various components
I am looking only to the fft and i have noticed something
The fft looks better if:
1) i increase the supply voltage
2) i reduce the gain on the npn
To do so i have used a more powerful npn
Now the weird question.
I have seen and bought some spectacular npn bjt from Toshiba
I am attaching the pdf here under


http://www.jmnic.com/pdf/2sc/2SC2238A.pdf


Questions:
1) can i be confident that this bjt will show similar results to that of the lower power bjt ?
2) which parameters in the data sheet i have to look at to understand if the results with LTSpice will be equal of even better ?

I have decided to go for a to220 package because it seems to me easier to heatsink ... i intend to use high voltage supply (around 60V like the Radford).
Maybe i am completely on the wrong path but i feel that high voltage supplies give spectacular results with the right bjt. I will upload a fft ... it is impressive ... no 3rd to speak of and just a little nice 2nd .. a little taste of tubes
My main goal remains always the same ... optimize the very very very basic circuit to see which level of performance i can get by "stretching" a very high quality npn.
To build a one bjt line preamp.
Then i will build it and take it to a friend place ... who has a high price tube line stage ... i would like to make him look like this
It is my mid term challenge
Thank you very much again
Have a nice day
Kindest regards, gino

Last edited by ginetto61; 3rd July 2014 at 06:44 AM.
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Old 3rd July 2014, 06:40 AM   #17
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Quote:
Originally Posted by kouiky View Post
Does the library include jfet models, by chance?
Hi i am attaching the part of the txt where all the components are listed

*
* Cordell Models - 04/20/2011
*
* copyright Cordell Audio April 2011
*
* BJT Models
*
* 2N3904 2N3906
* 2N4401 2N4403
* 2N5087 2N5089
* 2N5210
* 2N5551 2N5401
* 2SC3503 2SA1381
* 2SC3601 2SA1407
* BC550 BC560
* BD139 BD140
* MJE243 MJE253
* MJE340 MJE350
* MJE15032 MJE15033
* MJL21194 MJL21193
* MJL3281 MJL1302
* MJL4281 MJL4302
* NJL3281 NJL1302


Regards, gino
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Old 3rd July 2014, 07:05 AM   #18
Mooly is offline Mooly  United Kingdom
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The one transistor gain stage as drawn probably isn't practical because of C2 which causes the gain to increase dramatically. The exact gain figure and response of the stage really does now depend on the transistor and its properties rather than the other components defining those properties. It would be much more usual to include a series resistor with R2 to give a defined and repeatable gain.

All these single gain stage circuits (like this and the Radford) always generate 2nd (even) harmonic distortion and not 3rd odd order. And that is one of the reasons many like the sound of these type of circuits.

(its easy to chase numbers in simulation. I've had spectacular results from trying strange or non obvious devices but they wouldn't translate to real world builds)
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Old 3rd July 2014, 07:10 AM   #19
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by kouiky View Post
Does the library include jfet models, by chance?
A few.
Attached Images
File Type: png Capture.PNG (18.2 KB, 33 views)
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Old 3rd July 2014, 07:23 AM   #20
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Originally Posted by Mooly View Post
The one transistor gain stage as drawn probably isn't practical because of C2 which causes the gain to increase dramatically. The exact gain figure and response of the stage really does now depend on the transistor and its properties rather than the other components defining those properties. It would be much more usual to include a series resistor with R2 to give a defined and repeatable gain.
Good morning Mr Mooly
sorry i should have said that ... no C2 here ...
i am at work now and the circuit is in my home pc
Next time i will upload the actual spice schematic ... that is without C2 of course if not i would have seen the gain on the simulation i guess
The gain is no more than 2 in my tests

Quote:
All these single gain stage circuits (like this and the Radford) always generate 2nd (even) harmonic distortion and not 3rd odd order.
And that is one of the reasons many like the sound of these type of circuits.
Interesting. The thing is that the 2nd is 100 dB below the fundamental and the 3rd ... i cannot see it almost
So there is indeed some 2nd ... but extremely low
Much lower than in some commercial line preamp i mean

Quote:
(its easy to chase numbers in simulation. I've had spectacular results from trying strange or non obvious devices
I see ... but i am focused in very obvious devices ... like better npns.
With better performance.
I feel a sort of prejudice ... that high supply voltage is only for tubes.
Why if high supply voltages give better results ? and if the component can bear them of course ... but with small currents high voltages are perfectly fine.

Quote:
but they wouldn't translate to real world builds)
i agree ... i have been told very clearly that sim is just a start , a part of the story ... than quality of lay out and above all of the power supply play a decisive role
But maybe this is a small step for the mankind but a giant leap for ginetto

Thanks a lot again.
Have a nice day, gino

Last edited by ginetto61; 3rd July 2014 at 07:28 AM.
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