SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011

[culteousness1]

Thanks again! The only thing that I am not aware of is the coil resistance because I don't know the resistance of the relay Bruno used.
But I can have a look at yours and compare, now.

 

[helterbelter]

Greetings Folks,
After many requests, here's a crude schematic for the 9K.  

http://www.dopplerstudios.com/pictures/SSL 9K-42Sch.pdf

The link doesn't work.... well, at least not on my computer.....

 

[bruno2000]

Greetings Folks,
After many requests, here's a crude schematic for the 9K.  

http://www.dopplerstudios.com/pictures/SSL 9K-42Sch.pdf

The link doesn't work.... well, at least not on my computer.....

Well, if my computer would stop making mistakes, it would work.  Please try again.
Best,
Bruno2000

 

[helterbelter]

Thanks !

Looking great by the way. I was very curious for both the meterstage and the lowcut filter. The meterstage is done different than the circuits I know of.

Cool.

 

[bruno2000]

Thanks again! The only thing that I am not aware of is the coil resistance because I don't know the resistance of the relay Bruno used.
But I can have a look at yours and compare, now.

The coil resistance of the relays I used is 370 Ohms.  Hope this helps!
Best,
Bruno2000

 

[culteousness1]

Thanks Bruno! So yours are 370 Ohms and those Bruce used are 720 Ohms.
Both work. I will choose one in this interval.

 

[Piotr]

Hi !

I'm stuffing two boards and I'm stuck on the 100nF bypass caps (don't laugh...).

There are 25 specified on the BOM, 25 highlighted in yellow on Bruno's pdf, yet two seem missing on both documents, those by IC3, by the R3 trimmer. On Bruno's picture at the beginning of the thread there are 27 bypass caps... 

So either I'm totally stupid which is always possible at this time of night or there's a mistake somewhere and we need 27 100nF caps per build...

As usual, general good humor and understanding welcome as is an answer by the knowledgeable ones !!!

Thanks, Piotr.

 

[bruno2000]

Hi !

I'm stuffing two boards and I'm stuck on the 100nF bypass caps (don't laugh...).

There are 25 specified on the BOM, 25 highlighted in yellow on Bruno's pdf, yet two seem missing on both documents, those by IC3, by the R3 trimmer. On Bruno's picture at the beginning of the thread there are 27 bypass caps... 

So either I'm totally stupid which is always possible at this time of night or there's a mistake somewhere and we need 27 100nF caps per build...

As usual, general good humor and understanding welcome as is an answer by the knowledgeable ones !!!

Thanks, Piotr.

Well, it looks like my computer can't count or color very well.  You are correct, it takes 27 100nF bypass caps, and you correctly spotted the ones left out of the BOM and the layout PDF.  I'll make the corrections.
Thanks!
Best,
Bruno2000

 

[Piotr]

Thanks Bruno !!!

well then I'm not crazy... Great project so far, Gustav's board of your layout are first class, simple and easy to stuff. Waiting for news from AML concerning the pots, are there alternatives ???

Regards, Piotr.

 

[bruno2000]

Thanks Bruno !!!

well then I'm not crazy... Great project so far, Gustav's board of your layout are first class, simple and easy to stuff. Waiting for news from AML concerning the pots, are there alternatives ???

Regards, Piotr.

Greetings Piotr,
Thanks for pointing out the errors.  I believe they are fixed now.
Audio Maintenance are the only folks I know of that stock these odd pots, and right now they seem to be out of the 2k2 r/log pots. I'll see if I can find out the estimated delivery.
Best,
Bruno2000

 

[culteousness1]

I am waiting for the pots, too. So will write a mail to musikding and ask if they can order those pots.

Let's see...

 

[Whoops]

When can we expect the SSL 4K?

thanks

 

[bruno2000]

When can we expect the SSL 4K?

thanks

I have built a couple of prototypes, and Gustav has the Gerbers (although I understand that he's been slammed with other work recently).  The boards will have the added footprint for the Haufe input transformers.  Should be any day now.
Best,
Bruno2000

 

[Piotr]

Hi all !

Colin from AML, responded to my inquiry about the 2k2 RLog pots that they should be back in stock in about 8 weeks. Thanks to him for the update, I have then 8 weeks to come up with a funny idea for the faceplate !!!

 

[RedNoise]

Hahaha!Same here , 8 weeks to draw a redish faceplate! ;D

 

[Brolik]

I'm a little confused by the part number suggested for R1 & R2 in the BOM. The part calls for a 10 ohm "fusing" resistor. The part mentioned seems to be a very standard (albeit very small) 1/3rd watt 10 ohm resistor, the datasheet doesn't mention any "fusing" type quality at all. Am I missing something?

The more I learn, the more I feel like a fool.

Thanks in advance for your help.

 

[bruno2000]

I'm a little confused by the part number suggested for R1 & R2 in the BOM. The part calls for a 10 ohm "fusing" resistor. The part mentioned seems to be a very standard (albeit very small) 1/3rd watt 10 ohm resistor, the datasheet doesn't mention any "fusing" type quality at all. Am I missing something?

The more I learn, the more I feel like a fool.

Thanks in advance for your help.

"Fusing" is probably an inappropriate word to use.  "Flameproof' would be better.  The purpose of these resistors is to "act" as a fuse if there is a catastrophic fault/failure on the board.  They will just open up without the typical embarrassing acrid smell, and most importantly, they won't damage the board.
Hope this helps!
Best,
Bruno2000

 

[Brolik]

That helps immensely, thanks. On another note, I've just noticed a shortage of the 100nf bypass caps on my BOM spreadsheet. It should be 27 per channel as opposed to 24. For anyone who has ordered parts using it, I apologize. I'll learn how to count before next time. I will update the spreadsheet now.

 

[bruno2000]

That helps immensely, thanks. On another note, I've just noticed a shortage of the 100nf bypass caps on my BOM spreadsheet. It should be 27 per channel as opposed to 24. For anyone who has ordered parts using it, I apologize. I'll learn how to count before next time. I will update the spreadsheet now.

Yes, I had to learn to count, too.  My original BOM called for 25.  The correct number IS 27.
Best,
Bruno2000

P.S.  I hear that the 4K boards will be ready soon! See Gustav's thread.

 

[Piotr]

Hi to you all,

just finished building two 9Ks, been quickly calibrating the low pass and gain, everything seems ok on this first power up.
I'll try to take some picture this week end and in the meantime here's my BOM, in which I just left out the resistors, since this is pretty obvious...

Hope this helps !!!

http://piotrskotnicki.pagesperso-orange.fr/Site/DIY_files/SSL%209K%2051X%20-%20Mouser%20BOM%20-%20060311.xls