To hell with pride. I need help w. Grounded grid Pre-amp

kmj · 7th December 2006, 06:48 PM

Some years ago I got ahold of "Audio reality" and bought the parts for the grounded grid preamplifier. Since then I have built and rebuilt it about four times without getting it to work properly. And this is supposed to be an moderately easy project, or so i'm told.
Since I now have spent enough money to build it twice (if it worked) I can't just throw it out, and I have been close a couple of times...
So I downloaded Eagle and a library containing tubes but couldn't get it to work, some problem with pins unable to get wired or connected, so as a final solution I am forced to ask for help.

So, is there a kind soul here who has the book and can design a PCB for both the PSU and the amplifierstage on one or two boards?
Ofcourse without parts designated since it is a lisenced product after all.

kmj · 8th December 2006, 08:57 AM

Noone? It doesn't have to be a work of art. As long as it works.

I did find a PCB for the PSU, from the transformer to R16R18 so I "only" need what comes after that.

mississippi · 8th December 2006, 09:27 AM

Is there a schematic diagram or a link to this somewere? It helps me and maybe some others to understand maybe the problem?

pinkmouse · 8th December 2006, 09:29 AM

Kmj, learn to produce your own footprints, and you'll never look back. There are a couple of good tutorials on the net, and once you get it down then you will find nothing is beyond you. I think there is even a script generator somewhere on the web that does circular arrays of pins. Go for it!

edit: And you will most likely find that your valve socket pinout doesn't actually match any of the available footprints anyway, they are usually larger or smaller in diameter, and different drill sizes, as sockets are totally non standard. This has caught me before...

kmj · 8th December 2006, 11:08 AM

Quote:

Kmj, learn to produce your own footprints, and you'll never look back. There are a couple of good tutorials on the net, and once you get it down then you will find nothing is beyond you.

Oh, I can make PCBs and use Eagle, no problems there. But I can't get the library containing the sockets to work. Some of the connections to the different pins doesn't connect. So to speak.

Quote:

Is there a schematic diagram or a link to this somewere?

No, only in the book Audio reality. I was hoping that someone who owned it hade made something but I guess that I'll just have to sit down with pensil and paper instead.

pinkmouse · 8th December 2006, 11:15 AM

Quote:

Originally posted by kmj
Oh, I can make PCBs and use Eagle, no problems there. But I can't get the library containing the sockets to work. Some of the connections to the different pins doesn't connect. So to speak.

Exactly, make your own. Start with the ones in the library, and create your own footprint to fit your sockets.

kmj · 8th December 2006, 11:19 AM

Ah! Now I get what you mean. I made a slight misstranslation and read your reply as "make your own board". So it's footpads those things are called. My misstake and I'll get to it.
Thanks.

pinkmouse · 8th December 2006, 11:33 AM

No problem. Learning to create footprints in Eagle is the most important step to get the best out of the program.

7th December 2006, 06:48 PM	#1
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	To hell with pride. I need help w. Grounded grid Pre-amp Some years ago I got ahold of "Audio reality" and bought the parts for the grounded grid preamplifier. Since then I have built and rebuilt it about four times without getting it to work properly. And this is supposed to be an moderately easy project, or so i'm told. Since I now have spent enough money to build it twice (if it worked) I can't just throw it out, and I have been close a couple of times... So I downloaded Eagle and a library containing tubes but couldn't get it to work, some problem with pins unable to get wired or connected, so as a final solution I am forced to ask for help. So, is there a kind soul here who has the book and can design a PCB for both the PSU and the amplifierstage on one or two boards? Ofcourse without parts designated since it is a lisenced product after all. __________________ .....Where the music comes to die.

8th December 2006, 08:57 AM	#2
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	Noone? It doesn't have to be a work of art. As long as it works. I did find a PCB for the PSU, from the transformer to R16R18 so I "only" need what comes after that. __________________ .....Where the music comes to die.

8th December 2006, 09:29 AM	#4
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Kmj, learn to produce your own footprints, and you'll never look back. There are a couple of good tutorials on the net, and once you get it down then you will find nothing is beyond you. I think there is even a script generator somewhere on the web that does circular arrays of pins. Go for it! edit: And you will most likely find that your valve socket pinout doesn't actually match any of the available footprints anyway, they are usually larger or smaller in diameter, and different drill sizes, as sockets are totally non standard. This has caught me before... __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

8th December 2006, 11:19 AM	#7
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	Ah! Now I get what you mean. I made a slight misstranslation and read your reply as "make your own board". So it's footpads those things are called. My misstake and I'll get to it. Thanks. __________________ .....Where the music comes to die.

8th December 2006, 11:33 AM	#8
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	No problem. Learning to create footprints in Eagle is the most important step to get the best out of the program. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

8th December 2006, 09:27 AM	#3
mississippi diyAudio Member Join Date: Apr 2006 Location: holland	Is there a schematic diagram or a link to this somewere? It helps me and maybe some others to understand maybe the problem?

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