SSL 9K Mic Pre

[G-Sun]

I'll make a shootout of the pre later,
and then I can conclude more about the sonic quality and usability.

 

[EmptyMusicBox1]

Hi everyone !

i have just finish my 9K SSl preamp and i have a problem ...

The preamp Working good with a LINE source and a Static MIC

But not working with a SM57 ....

i have a Go betwin interface how do you have Wire ?

thanks

Hi thanks for the shema ! it's good for that !

i want just check with you the VR3AB :

for my SSl 9k i use a : Omeg 2K2 Log C with a Resistance 27R and 39R it's correct ?

 

[s2udio]

Hi everyone !

i have just finish my 9K SSl preamp and i have a problem ...

The preamp Working good with a LINE source and a Static MIC

What do you mean by " Static MIC" ?

But not working with a SM57 ....

They work fine with SM57's...........?

In fact any Dynamic Mic and any condenser as long as your providing the 48v.
And the dual gang rev log 2.2k is all that is required......maybe a 1db loss over a 2.5k pot.
The added resistors are not really required.

Edit missed the dec point !
Thx harpo

 

[Harpo]

for my SSl 9k i use a : Omeg 2K2 Log C with a Resistance 27R and 39R it's correct ?

Dual 2k2 rev.log is correct (and the max.gain limiting resistors are needed). The min.gain raises from +10dB with dual 2k5 rheostats to +11dB from your dual 2k2 rheostats on paper (the omeg pots come with +/-20% tolerance of rated resistance). I would use shielded mic cable between each deck and pcb, cable shield one side connected to a low impedance source instead of your unshielded, long, single, untwisted wires. YMMV.

 

[darkcharly]

Glad you sorted it out with Ricardo's help.
Enjoy the pre... it is really usefull!!!

Mine was used 2 weeks ago for drum recordings - came out excellent and easy to mix.

have you any samples to share?
I would be very happy to hear
Cheers!

 

[chefducuisine]

darkcharly,

I have added two Zip files containing 3 bar samples from BD, SD and OH to my SSL9k gallery.
Be shure to download both files and check the read-me file.

http://twin-x.com/groupdiy/thumbnails.php?album=510

 

[EmptyMusicBox1]

Hi everyone !

i have just finish my 9K SSl preamp and i have a problem ...

The preamp Working good with a LINE source and a Static MIC

What do you mean by " Static MIC" ?

But not working with a SM57 ....

They work fine with SM57's...........?

In fact any Dynamic Mic and any condenser as long as your providing the 48v.
And the dual gang rev log 2.2k is all that is required......maybe a 1db loss over a 2.5k pot.
The added resistors are not really required.

Edit missed the dec point !
Thx harpo

Thanks for your answer !
My preamp work now ! I hav just check my 5534 and One was dead !

for my SSl 9k i use a : Omeg 2K2 Log C with a Resistance 27R and 39R it's correct ?

Dual 2k2 rev.log is correct (and the max.gain limiting resistors are needed). The min.gain raises from +10dB with dual 2k5 rheostats to +11dB from your dual 2k2 rheostats on paper (the omeg pots come with +/-20% tolerance of rated resistance). I would use shielded mic cable between each deck and pcb, cable shield one side connected to a low impedance source instead of your unshielded, long, single, untwisted wires. YMMV.

thanks Harpo i have just utilise a cable shield fot all my audio connection !


My project  channel-strip : http://groupdiy.com/index.php?topic=51894.40

 

[darkcharly]

darkcharly,

I have added two Zip files containing 3 bar samples from BD, SD and OH to my SSL9k gallery.
Be shure to download both files and check the read-me file.

http://twin-x.com/groupdiy/thumbnails.php?album=510

Hey, chefducuisine
I am very excited to hear the samples! Sounds very clean, clear and very real. Especially the snare. Very useful and clean to work then in post-production.
Great job! I'll finish mine soon.
Thanks for the samples.
Cheers!

 

[G-Sun]

A ssl9k shootout with the Hamptone HJFP2:
https://soundcloud.com/geir-sol/sets/ssl9k-hjfp2-preamp-test/s-14GUk

Not the best room.
My ssl9k ch2 is used, and the sm7b reveals some hum.
Test1 and test 2 are two matched NT5.
SM7b and C1 are different takes.
The C1 mic seems broken or something -only back capsule working?
Trion 8000 is split before going into each peamp.

Anyway, I get an impression of the ssl9k.
The ssl9k seems thinner than the HJFP, clear but not bright.
It has some sort of midrange-presence, but that's probably mostly the bad room being highlighted.

 

[darkcharly]

Hey!
My psu measure correctly  -18v and 48v.
+18v rail reads 9v.
I changed the LM7818 (another brand) and now shown +14 volt.
I have to switch brands until I find the correct measurement?
any ideas?
Thank you!

 

[G-Sun]

Hey!
My psu measure correctly  -18v and 48v.
+18v rail reads 9v.
I changed the LM7818 (another brand) and now shown +14 volt.
I have to switch brands until I find the correct measurement?
any ideas?
Thank you!

What kind of psu are you using?

 

[darkcharly]

Hey!
My psu measure correctly  -18v and 48v.
+18v rail reads 9v.
I changed the LM7818 (another brand) and now shown +14 volt.
I have to switch brands until I find the correct measurement?
any ideas?
Thank you!

What kind of psu are you using?

G-Sun:
i´m using keith´s power supply!
On 18volt rails:
20+20 transformer
7818cv, 7918c
2x 1000uF, 4x 100nF Caps
and Bridge Rectifier W10M  (1.5A 1000v)
Maybe the Rectifier should be smaller? :-\
Thank you!

 

[G-Sun]

i´m using keith´s power supply!
On 18volt rails:
20+20 transformer
7818cv, 7918c
2x 1000uF, 4x 100nF Caps
and Bridge Rectifier W10M  (1.5A 1000v)
Maybe the Rectifier should be smaller? :-\
Thank you!

Disclaimer: I'm not an expert

If you negative rail is outputting -18V, are everything mirrored on the positive?
In that case, check soldering or for faulty components.
Compare every voltage with negative rail.

 

[darkcharly]

i´m using keith´s power supply!
On 18volt rails:
20+20 transformer
7818cv, 7918c
2x 1000uF, 4x 100nF Caps
and Bridge Rectifier W10M  (1.5A 1000v)
Maybe the Rectifier should be smaller? :-\
Thank you!

Disclaimer: I'm not an expert

If you negative rail is outputting -18V, are everything mirrored on the positive?
In that case, check soldering or for faulty components.
Compare every voltage with negative rail.

Thank you G-Sun!!
I found a bad solder between the ground and a capacitor
You always have to check and recheck!
I will continue working on the project 
Cheers!

 

[darkcharly]

Hello!
I'm testing the SSL9k circuit with a dynamic microphone and only I get to hear my voice very low, below radio interference. I have checked my gain switch, Transistor (LM394) and my volt rails and everything seems fine. Any ideas where to check?
Thank you!

 

[chefducuisine]

Did you check for proper grounding - I never had any radio interference on this Pre. Even when used without any housing.
Other than that did you check if you installed all the required bridges? If you are using my layout please check Reply #585 - the bridges are marked in red colour.

It would be helpfull if you can trace the signal to know which stages of the pre are working properly. Are you able to do this? The easiest way would be to use your soundcard together with RMAA.

 

[darkcharly]

Did you check for proper grounding - I never had any radio interference on this Pre. Even when used without any housing.
Other than that did you check if you installed all the required bridges? If you are using my layout please check Reply #585 - the bridges are marked in red colour.

It would be helpfull if you can trace the signal to know which stages of the pre are working properly. Are you able to do this? The easiest way would be to use your soundcard together with RMAA.

Hey!
I installed the 3 bridges according to the original design keith.
I just downloaded RMAA. I will read the manual and I will see how I can apply it.
Thanks for the reply!

 

[darkcharly]

Hello!
Following the advice of chefducuisine, I tried the circuit 9k inserting an audio signal, and testing the circuit with an audio probe (listening to the audio signal through the circuit). The signal stops at pins 1 and 6 of the LM394 (Collector of each transistor). The LM394 is malfunctioning?
Thank you!

 

[G-Sun]

Hello!
Following the advice of chefducuisine, I tried the circuit 9k inserting an audio signal, and testing the circuit with an audio probe (listening to the audio signal through the circuit). The signal stops at pins 1 and 6 of the LM394 (Collector of each transistor). The LM394 is malfunctioning?
Thank you!

Is the voltage for the IC right? Checked soldering?

 

[EmptyMusicBox1]

what's the Best ? :

(MAT 02EH 0426) or (MAT 12AHZ 1340) ??

i have both

thanks