Whoops

Re: SSL 9K Mic Pre
« Reply #700 on: April 13, 2020, 06:06:34 PM »
And for the wiring of front switches? do you have some schematic?

What front switches are you referring to?


Ricardus

Re: SSL 9K Mic Pre
« Reply #701 on: April 13, 2020, 10:42:15 PM »
What front switches are you referring to?

He must mean the +48, Phase, Pad, and High Pass.
Audio mastering for hire..

Whoops

Re: SSL 9K Mic Pre
« Reply #702 on: April 13, 2020, 10:45:32 PM »
He must mean the +48, Phase, Pad, and High Pass.

maybe not because those are not part of this project

Re: SSL 9K Mic Pre
« Reply #703 on: April 14, 2020, 03:45:06 AM »
I understand,

is there a project dedicated to a front panel? I see some post that speaks about a Jensen A016 standard preamp input circuitry. It's this one or another one?

Thanks a lot for all the info.

Ricardus

Re: SSL 9K Mic Pre
« Reply #704 on: April 14, 2020, 11:16:37 AM »
maybe not because those are not part of this project

 The SSL 9K pre doesn't have those 4 switches? Mine sure do.
Audio mastering for hire..

Whoops

Re: SSL 9K Mic Pre
« Reply #705 on: April 14, 2020, 02:10:59 PM »
The SSL 9K pre doesn't have those 4 switches? Mine sure do.

Then your SSL9K project is not the same project as the one this thread relates to.

Since in this SSL 9K project there's no +48, Phase, Pad, and High Pass

Whoops

Re: SSL 9K Mic Pre
« Reply #706 on: April 14, 2020, 02:18:20 PM »
I understand,

is there a project dedicated to a front panel? I see some post that speaks about a Jensen A016 standard preamp input circuitry. It's this one or another one?

Thanks a lot for all the info.

I really don't know what you're asking, it's confusing.

If you're looking for an input board with PAD, POLARITY and 48V, search google for JLM Go between, that's what most people used

If you're looking for a front panel, you should search here in the forum, maybe in the white market also, since there were people selling FP for this project

You're a new member,  please always read the project thread and search before posting.
Your questions are already replied in this thread a multitude of times.
So please read the thread first, that's the best advice I can give you for when you start a project. You will learn a lot.

________

Forum Rules:

6. Use the search function (thoroughly) before posting.  It is quite possible your question may have already been answered by knowledgeable members that have been generous with their time.  A tremendous wealth of knowledge is actively updated and compiled in the "Meta" threads--take advantage of them.

4. You will find that the members of this community are incredibly courteous and respectful of each other, so please reciprocate those gestures. Leave the Flame-war mentality at another forum.  Personal attacks as well as general hateful comments (regarding race, religion, gender, sex, etc...) will not be tolerated.

Re: SSL 9K Mic Pre
« Reply #707 on: April 14, 2020, 02:38:59 PM »
You are right, and sorry.

English is not my language, so I know sometimes I can't explain right... Sorry for that

Yes, I'm looking for an input board. Pad, 48V and polarity. I will search the JLM.

Yes, I read some threads. But sometimes there is a lot of information and it's normal that I have some questions.

Thanks for the information!!


Whoops

Re: SSL 9K Mic Pre
« Reply #708 on: April 14, 2020, 07:58:56 PM »
Yes, I read some threads. But sometimes there is a lot of information and it's normal that I have some questions.

No worries for the questions, me and other members can help you out on that.
But please read this thread first, because then you will have a better knowledge about this particular project.

This is the JLM Go between, it was the most used input pcb for PAD, POL REV and 48V that people used in this project,
it was what I used in the 8 units I built:

https://www.jlmaudio.com/shop/go-between-kit.html?display_tax_prices=1


You can also do it with switches and resistors without a pcb but it's more work involved
« Last Edit: June 09, 2020, 05:54:42 PM by Whoops »

Re: SSL 9K Mic Pre
« Reply #709 on: April 15, 2020, 12:12:26 PM »
This is the JLM Go between, it was the most used input pcb for PAD, POL REV and 48V that people used in this project,
it was what I used in the 8 units I built:

https://www.jlmaudio.com/shop/go-between-kit.html?display_tax_prices=1


Yes,

I bought two of them, and two of this:

https://jlmaudio.com/shop/vu-buffer-peak-led-kit.html?display_tax_prices=0

Thanks for the moment.


JAY X

Re: SSL 9K Mic Pre
« Reply #710 on: June 09, 2020, 11:05:28 AM »
Hi!

I was checking the 9k preamp schematic, (rev 1.0 5/15/2003), and noticed that both IC29 and IC22 (5534'S  of the first gain stage), share a single 100nf cap as rail decoupling cap!!.  For me this is strange. Normally you place at least one 100nf between rails for EACH opamp...but here... there is only one for two opamps!!. Strange materials economy...!! ???...  ¿Is there a reason for this decoupling scheme?  ¿Isn't it better practice to give each opamp its own decoupling cap?. .

Thank you for your advise!!
Jay x

Re: SSL 9K Mic Pre
« Reply #711 on: July 08, 2020, 07:50:47 AM »
Hello,

is this a good candidate for the power transformer?

https://www.mouser.es/ProductDetail/546-229B20

https://www.hammfg.com/files/parts/pdf/229B20.pdf

Thanks.

Whoops

Re: SSL 9K Mic Pre
« Reply #712 on: July 08, 2020, 11:58:06 AM »
is this a good candidate for the power transformer?

No. It has PCB pins and it has low power.

But this is a good candidate:

https://pt.farnell.com/multicomp/vtx-146-030-118/transformer-30va-2x-18v/dp/1675053?st=toroidal%20transformer



Re: SSL 9K Mic Pre
« Reply #713 on: July 09, 2020, 01:35:00 AM »

Re: SSL 9K Mic Pre
« Reply #714 on: July 13, 2020, 07:19:20 AM »
How important is the use of shield cable for inputs and outputs on this preamp?

Because I see some photos with standard wire and others with shielded cable.

It's really necessary?

Thanks.

Ricardus

Re: SSL 9K Mic Pre
« Reply #715 on: July 13, 2020, 03:47:34 PM »
How important is the use of shield cable for inputs and outputs on this preamp?

Because I see some photos with standard wire and others with shielded cable.

It's really necessary?

Thanks.

Can't hurt. I usually run Belden 8451 inside projects like this, but I think I am going to look for something a little more flexible. A similar style wire maybe from Mogami.
Audio mastering for hire..

Re: SSL 9K Mic Pre
« Reply #716 on: July 14, 2020, 09:26:29 AM »
Can't hurt. I usually run Belden 8451 inside projects like this, but I think I am going to look for something a little more flexible. A similar style wire maybe from Mogami.

Thanks!

I have a lot of problems for finding the 2,2k dual gang rev pot. I contact with Audio Maintenance with no luck, I'm still waiting a response from him.

And I prefer a pot than a resistor rotary switching, that was mentioned in this post.

Anyone can help me with the potentiometer?




Ricardus

Re: SSL 9K Mic Pre
« Reply #717 on: July 14, 2020, 12:42:12 PM »
Thanks!

I have a lot of problems for finding the 2,2k dual gang rev pot. I contact with Audio Maintenance with no luck, I'm still waiting a response from him.

And I prefer a pot than a resistor rotary switching, that was mentioned in this post.

Anyone can help me with the potentiometer?

 His part number is OM-01-073

 He had some in stock when I ordered some a few months ago.

Just go to the web site and try an order.
Audio mastering for hire..

Whoops

Re: SSL 9K Mic Pre
« Reply #718 on: July 14, 2020, 11:18:35 PM »
How important is the use of shield cable for inputs and outputs on this preamp?

I always use shielded cable for inputs and outputs in all the gear I build, some people dont have thin shielded cable around and use standard wires. It's a balanced input so the shield might not be needed but It doesnt hurt also.

On the output the balancing circuit is on a separate pcb, I would use shielded for shure between the Mic Pre PCB and the Balancing PCB.



Whoops

Re: SSL 9K Mic Pre
« Reply #719 on: July 14, 2020, 11:22:14 PM »
I have a lot of problems for finding the 2,2k dual gang rev pot. I contact with Audio Maintenance with no luck, I'm still waiting a response from him.

Anyone can help me with the potentiometer?

Audio Maintenance one and only. Contact them again

Besides that post a Wanted post in the black market for those pots, I'm sure some fellow members bought a few more from audio maintenance than they used and have them in a drawer.
I might still have some but I'm not going to the workshop soon.

I roughly estimate that 60% to 70% of the pcbs and parts members buy never get materialized into projects


 

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