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Happy New Year!


TillM

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #540 on: January 08, 2017, 09:44:57 AM »
If you used the correct Pot for gain I don't believe it's the gain pot, it's probably something in the circuit that is wrong.
It could be a lot of different things impossible to know at a distance.

Before anything you should:
-Check all Electrolytic caps values and Correct placement.  They are polarized + and - are on the correct holes?
- Check all resistor values
- Check all capacitor values
- Check MAT02 placement, is the orientation correct
- Check all IC's Orientation
- Check all solder joints and check for possible solder bridges
- Measure the voltages across each IC and transistor Pins, do a voltage chart, show us

Do you have a friend with electronics knowledge that could help you?

Tomorrow I go to a friend.
He is electrician and also has a oscilloscope.
One thing came in my mind.
For the Second Build I use the Switches from the BOM.
For the First build I use Switches from my local Hardware shop.
They only have 20v. From the BOM they have 250v.
Maybe this is the fault.
Thanks for your help.


Whoops

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #541 on: January 08, 2017, 09:49:14 AM »
They only have 20v. From the BOM they have 250v.

I really don't think the switchs voltage rating is the issue.
But I would change the 48V Phantom Power switch.


TillM

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #542 on: January 11, 2017, 12:15:45 PM »
I really don't think the switchs voltage rating is the issue.
But I would change the 48V Phantom Power switch.

I've found the mistake.
The 2k2 Poti is broken.
I repaired it and do some solder work again.
Now, everything works perfect.
Thanks to everybody at groupdiy who helped me, esspecially Whoops!
Now i'm looking for new preamp projects  :D

Whoops

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #543 on: January 17, 2017, 10:03:04 PM »
Happy you sorted it TillM,
wish you good fun in recording with it

Whoops

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #544 on: January 17, 2017, 10:04:40 PM »
I'm looking to buy some 4K pcb's,
if anyone has some spare ones that could sell or will never finish his project just let me know

Thank you

audiophreak

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #545 on: January 18, 2017, 09:48:17 PM »
Hello All,
                 Looking to build two more of the SSL9k mic pres, and Gustav seems to only offer the 500 series , anyone know where I can get a couple of the older PCBs he used to sell ??


Thanks in advance  :)
" Music washes away from the soul, the dust of everyday life "   ... in loving memory of my Father.

Whoops

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #546 on: January 18, 2017, 10:33:09 PM »
Hello All,
                 Looking to build two more of the SSL9k mic pres, and Gustav seems to only offer the 500 series , anyone know where I can get a couple of the older PCBs he used to sell ??
Thanks in advance  :)

Hello Audiophreak, if you don't want to do the 500 series format it's fine you can still use the current pcb's, use them in the format you want.
At the present there isn't really any reason to do the 9K in the older pcb's, you don't have PAD, 48V, Or Phase, so you had to get a Go Between or something similar, also the POT is wired (more uneeded wires) there was no provision in the board for 15V to supply the TL052, so you had to improvise a voltage reduction. Also the Output was unbalanced so an extra balancing pcb and circuit was needed.

With the present 9k pcb with the 500 series format you have all that in 1 board.
If you don't need the variable highpass filter or the Led Meter you just do populate or bypass those parts on the board.

audiophreak

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #547 on: January 18, 2017, 10:38:26 PM »
Thanks Whoops !!  what about the edge connector ?
" Music washes away from the soul, the dust of everyday life "   ... in loving memory of my Father.

Whoops

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #548 on: January 18, 2017, 10:45:24 PM »
Thanks Whoops !!  what about the edge connector ?

I just solder the wires directly to the pads where the connector would go, it's a matter of personal preference as I always prefer to have soldered wires instead of connectors, it's one less thing that can contribute for intermittent connections.

But if you prefer to have the edge connector just buy it from Capi:

http://capi-gear.com/catalog/product_info.php?cPath=84_86&products_id=147

audiophreak

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #549 on: January 18, 2017, 10:48:43 PM »
Aaahhh, I prefer a soldered connection as well , Thanks for the tips !! :)
" Music washes away from the soul, the dust of everyday life "   ... in loving memory of my Father.


Whoops

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #550 on: January 18, 2017, 11:21:01 PM »
This was a great idea but was overshadowed but the 9K5:

https://groupdiy.com/index.php?topic=46784.0

Whoops

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #551 on: January 18, 2017, 11:27:18 PM »
It's not my build I just found it in the forum

SSL 9K5 with Bo's DI:




Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #552 on: January 19, 2017, 03:53:03 AM »
Scratchy Gain Pot & Oscillation

So, having finished two of the 9k5 modules, unfortunately, the one has the scratchy gain pot which then turns to oscillation when the gain is turned up past the 1 o'clock position. I have matched R105 & R69 as well as R109 & R73 as suggested in a thread elsewhere on this forum, to no avail.

Since the one module  is working perfectly, I do thankfully have a working reference. My next step is to compare voltages between the two since it has also been suggested that one of the causes of the scratchy pot issues is likely to be dc voltage offsets in the servo section, or gain control. (The Pot itself checks out fine and I have not been able to spot any misplaced components)

If anybody with similar issues has managed to resolve them, I would be very interested in what the root cause was.

audiophreak

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #553 on: January 19, 2017, 08:33:30 AM »
This was a great idea but was overshadowed but the 9K5:

https://groupdiy.com/index.php?topic=46784.0

Thanks Whoops !!   Good read and info and those pix sparked some ideas ...     ;D
" Music washes away from the soul, the dust of everyday life "   ... in loving memory of my Father.

justinheronmusic

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #554 on: January 19, 2017, 09:09:36 AM »
Is there a pretty big sonic difference between the 4k and the 9k? I'm still having a hard time pulling the trigger on the 9k. I would be using these as makeup gain for the DIYRE SB2 summing box. Thoughts?
Justin Heron
Artist / Recording Engineer
www.justinheron.com
www.instagram.com/justin.heron

Whoops

Re: SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
« Reply #555 on: January 19, 2017, 11:44:19 AM »
Is there a pretty big sonic difference between the 4k and the 9k?

The circuit is totally different, compare schematics.
4K is said to be more "grainy, dirtier, more rock n rool"
9K is said to be "Clean, a lot of headroom, Hifi sounding"
Those descriptions are not my words, but the best thing is for you to listen both.

I would be using these as makeup gain for the DIYRE SB2 summing box. Thoughts?

I have some thoughs, use other thing as the makeup gain.
SSL 9K has huge gain you don't need that for makeup gain in a summing mixer.
Better to use your 9K's as microphone amplifiers and something else for makeup in your summing, like for example just the output section of a Neve BA283 card

But in the end it's your choice, I'm just telling you my thoughts