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

[Ricardus]

But now i recognize another Problem. The low cut pot sounds not like it cuts frequencies where it should do.

By turning cw it Sounds like some kind of sweep eq. It seems to boost the frequencies. I dont get it. Very Strange.
I think that i populated Everything the Right why. So i dont Know

Did you calibrate the HPF? It needs to be calibrated to work properly.

There are two pots on the board. One is to properly shape the "knee" of the filter, and the other is to gain match it to the volume when the HPF is switched off.

So if the knee is currently shaped with a peak (as opposed to being flat) the filter will cut lows but also raise the frequencies right at the point where the cutoff frequency is set.

If you're using the boards from PCB Grinder then you also need to fix the out of phase output issue. It involves cutting two PCB traces and running two jumpers.

 

[frejo89]

Youre just so great- thank you! Completely forgot that !!

Concerning the out of Phase output issue. Mine ist from pcbgrinder. I dont now the exactly Revision. But it Shows something like „bruno2000“

9K5 500 series Preamp | PCB Grinder

Single channel PCB based on the classic 9k preamp in 500 series package from groupdiy.com

www.pcbgrinder.com

I ordered it in october 22

 

[frejo89]

Did you calibrate the HPF? It needs to be calibrated to work properly.

There are two pots on the board. One is to properly shape the "knee" of the filter, and the other is to gain match it to the volume when the HPF is switched off.

So if the knee is currently shaped with a peak (as opposed to being flat) the filter will cut lows but also raise the frequencies right at the point where the cutoff frequency is set.

If you're using the boards from PCB Grinder then you also need to fix the out of phase output issue. It involves cutting two PCB traces and running two jumpers.

Can you Tell me How to fix this issue ? When my pcb is the affected one ?

 

[Ricardus]

Can you Tell me How to fix this issue ? When my pcb is the affected one ?

Which issue are you talking about?

 

[frejo89]

Which issue are you talking about?

Sorry. You were talking about These issue to fix on pcb:

„If you're using the boards from PCB Grinder then you also need to fix the out of phase output issue. It involves cutting two PCB traces and running two jumpers“

So were do i have to cut the traces and Running to Jumpers

 

[Ricardus]

There is a drawing on this thread somewhere. I have the drawing on my computer at home so I will post it later.

What about the HPF calibration. Did you already do it?

 

[frejo89]

There is a drawing on this thread somewhere. I have the drawing on my computer at home so I will post it later.

What about the HPF calibration. Did you already do it?

I already did the calibration. Its really a pleasure right now - I like it.

Ok - no stress to yourself. Feel free to post later, I will have a look at this.

Goog night!

 

[Ricardus]

I already did the calibration. Its really a pleasure right now - I like it.

Ok - no stress to yourself. Feel free to post later, I will have a look at this.

Goog night!

Here is the PDF. This view is from the component side of the board but the traces that need to be cut and the jumpers all go on the back side of the board.

 

[frejo89]

Thank you ! Working all fine now !
Great Preamp !

 

[Ricardus]

Thank you ! Working all fine now !
Great Preamp !

Excellent.

I love mine. I use them all the time.

 

[frejo89]

Hey together. Still stoked about my SSL 9k.

Another question :
Is there some mod of line in for the front? Or no chance to do this for having line jack in front in addition?

 

[emrr]

maybe @bruno2000 is also still a member here?

He (Joe Neil) passed away in 2018.

Joseph Neil Obituary (2018) - Ellijay, GA - Atlanta Journal-Constitution

View Joseph F. Neil's obituary, send flowers and sign the guestbook.

www.legacy.com

 

[Ricardus]

Ellijay. Wow. I'm not far from there these days.

 

[frejo89]

He (Joe Neil) passed away in 2018.

Joseph Neil Obituary (2018) - Ellijay, GA - Atlanta Journal-Constitution

View Joseph F. Neil's obituary, send flowers and sign the guestbook.

www.legacy.com

oh no, iam sorry. That is very sad to hear

my dad also passed away in 2018