AyoK
New member
Yes good point!
Thank you Carsten
Thank you Carsten
SSL 9K & 4K (E Series) 500 / 51X NEW BOARDS Mic Pre Thread 2011
- Thread starter bruno2000
- Start date
Help Support GroupDIY Audio Forum:
gnarmageddon
Active member
I hit a snag here ordering the pots. AML doesn't have the 2k2 20mm 2-gang potentiometers and I'm coming up with zilch for an alternative. Is there a substitute part possible?
Closest I can find are dual-gang pots rated for 2k.
Closest I can find are dual-gang pots rated for 2k.
culteousness1
Well-known member
2k as a substitute should be fine if you consider the usual part tolerances of potentiometers.
But are you sure that AML isn't out of stock temporally? It could be worth to email Colin at AML if you haven't already done.
Otherwise you can check your search engine of choice with the exact part number of the original OMEG pot.
Again, an updated profile including your location would make it easier to suggest alternative suppliers.
Hope this helps,
Carsten
But are you sure that AML isn't out of stock temporally? It could be worth to email Colin at AML if you haven't already done.
Otherwise you can check your search engine of choice with the exact part number of the original OMEG pot.
Again, an updated profile including your location would make it easier to suggest alternative suppliers.
Hope this helps,
Carsten
gnarmageddon
Active member
culteousness1 said:
I've got emails in. Fingers crossed.
If anyone has the original OMEG pot #'s (i've been digging for them) I'm most appreciative. The closest I can seem to find for a 20mm, dual gang 2k2 with through hole mounting is this guy here: http://cpc.farnell.com/omeg/pc2g16eco2k2a/pot-dual-gang-lin-2k2/dp/RE04428.
Done and done.
culteousness1
Well-known member
gnarmageddon said:
Sorry, but I don't have the exact part number either. You can check the following web page for reference.
If I am on the right track, the part number is something like: PC2C20BU.
The potentiometer you stated has the wrong taper law as it is linear instead of anti-log.
Cheers,
Carsten
gnarmageddon
Active member
Colin emailed me back and said they're expecting a new shipment in January. I think I'm good waiting four weeks for the 'right' part instead of rubbing a rabbits foot on a substitution.
gnarmageddon
Active member
bruno2000 said:
Mouser decided to mess with me.... Hard.... I'm building two of these and they sent me 55 of them. Ironically, "55" is about the number of times I A/B'd the boards and schematic to make sure I wasn't leaving a cap off.
gnarmageddon
Active member
http://imgur.com/uyAs4un
Just waiting on the pots to arrive - everything else is good to go. Did a military green powder coat on the fp's with pad printed demarcation. #BadAssery
Just waiting on the pots to arrive - everything else is good to go. Did a military green powder coat on the fp's with pad printed demarcation. #BadAssery
culteousness1 said:
Yes, I was going to advise that, I was sure Colin would order more, since he is the only supplier of this pots for the community for a long time and he is not going to run out of costumers for that product soon.
Hope the pots get in stock soon
gnarmageddon
Active member
Got a pair of both potentiometers on the way. Meter bridges are done, just waiting to solder in the pots and have the moment of truth firing them up.
gnarmageddon
Active member
omribgr said:haha ! I've fixed it
I took a razor and fixed it and now it works great without blowing the resistor.
Walk me through this if you can - one of my two blew the R1 on initial power-up. All solder joints appear okay. Should I try with the meter board removed?
culteousness1
Well-known member
gnarmageddon said:
Did you remove the unwanted copper on the meter board as advised?
Stagefright13
Well-known member
Hey Bruno! Ya sent me 2 prototype boards for 9k with A paper highlighted in green to show me A silk screen error. I think it was diodes? I have all the diodes in. Don't remember. The board says version 3.9 I have the 2 ganged pots in and 3 ganged pots, Mat 02's ya sent me. All the relays and A bunch of caps and stuff. Just need to order some wimas and chips. Had to move my studio A couple times so things got lost! And thanks for the pres finally I will be able to use them soon and send samples!
bruno2000
Well-known member
Stagefright13 said:
D305 and D306 are backwards on the silkscreen of V3.9. There is also a mod to adjust the gain of the HPF. Send me your email in a PM.
Best,
Bruno2000
Tedrummerx
Member
- Joined
- Aug 6, 2009
- Messages
- 17
Hey guys, just finished up a pair of 9k pres and they are sounding incredible! One thing I'm noticing is these pres are pretty hot, even with the pad engaged and gain all the way down, its too hot for loud sources like drums. Is this just common with the 9k? Has anyone tried to modify the pad circuit? Also thinking of maybe using a couple inline xlr pads on those loud sources like drums. Any opinions? Thanks!
Vac11
Well-known member
Thanks Bruno2000 for this amazing project. Im very happy with the sound of these preamps.... Everything was OK and pre was alive on the first on...
M.
M.
TillM
Well-known member
Tedrummerx said:
That's my question too.
I also want to use the 9k pre for my drums.
Hope someone can give a advice.
I'm also looking for the 4k pcb boards, so if someone also wants to order and Gustav will do it, please pm me.
TillM said:
You can increase the PAD atenuation by changing the PAD resistors,
the board used 2x 10k8 and 1x 2k2K resistor to form a U Pad.
I don't know how much attenuation that provides, so find that out.
I guess it's 15dbs because R1 is 5 times R2.
Then increase the level of atenuation by changing those 3 resistors.
For example if it's a 15dbs pad, try increasing it to 20, 25 or 30 dbs pad.
A good reading on PADs:
http://www.uneeda-audio.com/pads/
TillM
Well-known member
Whoops said:
thank you so much for this advice !
So this means, i can leave r1 with 2k2k and use for r2 a resistor that increase the pad.
Dumb question but isn't R1 and R2 not the same resistor ? so this must be mean for me, that the pad just is 6db.
Edit: I see it on the shematic, now I understand. Thank you very much !
My next question, can I use this switch ?
http://de.farnell.com/multicomp/2as4t2a1m6re/switch-toggle-spdt-mom-off-mom/dp/1550114
I ordered the pcb today.
I would take the 3 resistor out and use 2x 680ohms for R1 and 1x 150ohms for R2,
it will make a 20dbs PAD.
it will make a 20dbs PAD.
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