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

[ip_dalie]

Hi Guys. Does anyone know where to find the "pots" these days?

47k Triple R/Log
2k2 Dual R/Log

Cheers

Ip

 

[frejo89]

Hi Guys. Does anyone know where to find the "pots" this days?

47k Triple R/Log
2k2 Dual R/Log

Cheers

Ip

Yes. I got mine at AML:

https://www.audiomaintenance.com/acatalog/potentiometers.html

 

[ip_dalie]

Yes. I got mine at AML:

https://www.audiomaintenance.com/acatalog/potentiometers.html

Thanks Frejo!!! I didn't see the 47k before there, no picture on it haha. I see it now, I must be blind haha

Cheers!

Ip

 

[frejo89]

Thanks Frejo!!! I didn't see the 47k before there, no picture on it haha. I see it now, I must be blind haha

Cheers!

Ip

No Probs. I had the same problem finding it

 

[Zeker]

Hi all,
I have these pcb's since years, and the doppler studio website is down. Is there a way to find the bom somewhere?
Thanks!

 

[ip_dalie]

Hi all,
I have these pcb's since years, and the doppler studio website is down. Is there a way to find the bom somewhere?
Thanks!

Here you go Mate..

 

[frejo89]

hey folks!

I plan to build another SSL 9k5 again.

I have a question to this:
Is there a good replacement for the MAT-02H (more and more discontinued and also very expensive) ?

Iam thinking about a AS194H or something like that - any recommendation on this?

Furthermore if there are recommended replacements in case of better quality (less noisy) for the ICs - let me know

Thank you

 

[ip_dalie]

hey folks!

I plan to build another SSL 9k5 again.

I have a question to this:
Is there a good replacement for the MAT-02H (more and more discontinued and also very expensive) ?

Iam thinking about a AS194H or something like that - any recommendation on this?

Furthermore if there are recommended replacements in case of better quality (less noisy) for the ICs - let me know

Thank you

Hi Frejo.

I built 2 pairs SSL 9K with LM394, and its sound alrigh, never use MAT02 myself.

Cheers

Ip.

 

[frejo89]

Thanks for the information
So like I read, the AS194H is a replacement for the LM394 so far.

Do they all have the same pinout (AS194, LM394, MAT02) ?

There also is an AS394 around - should be nearly the same thing as the LM394

 

[ip_dalie]

Thanks for the information
So like I read, the AS194H is a replacement for the LM394 so far.

Do they all have the same pinout (AS194, LM394, MAT02) ?

There also is an AS394 around - should be nearly the same thing as the LM394

It has 8 pins, LM394 has 6 pins


Cheers

Ip.

 

[frejo89]

alright !

 

[Whoops]

I built 2 pairs SSL 9K with LM394

The LM394 is obsolete for many years now, just like the MAT02.

But anyway the MAT02EH was much better than the LM394, although both were a super-matched transistor pair

 

[Whoops]

I have these pcb's since years, and the doppler studio website is down. Is there a way to find the bom somewhere?

some more docs,
the schematic and the Polarity switch Fix for the original PCB

 

[Whoops]

SSL 4K E series for the 500 standard

Docs:

 

[digistu]

Hi,

I don’t know whether anyone is able to help me troubleshoot an SSL 9K I’m helping a friend out with?

The supply rails from my 500 series rack are bang on at +16v, 0v, -16v – all other modules are removed for the purposes of testing.

When I connect the module up (using an extension cable) I see a slight shift in the supply voltage at pins 12 & 14 to +16.7v & -15.3v (i.e. still 32v peak to peak but with a small offset), however if I engage any of the relays on the pad, phase or hpf I see a radical offset, and my rails become +23.4v and -8.6v (measured to ground). This change happens over a period of about half a second. This is all without ICs in place and the meter board disconnected. I don't want to try with the ICs inserted as long as the positive rail is exceeding their 22v rating, and I'm assuming this isn't inteded behaviour!

Things I’ve tried already:

• Confirmed the value of every resistor, both visually and with a multimeter
• Reflowed every solder joint, and generally tidied up the soldering
• Cleaned the board with isopropyl alcohol
• Checked continuity to ground of every component that should be at ground
• Removed and checked the HFE of the MAT02 (it read 332, which seems a little on the low side, however the behaviour didn’t change without it in the circuit)
• Removed, measured and resoldered all of the 100nF power supply filter caps
• Removed, measured and resoldered all of the 220uF electrolytic capacitors (in both of the above cases I still encountered the problem engaging the relays with the capacitors removed, eliminating the possibility that any of those caps had failed and were leaking current to ground – I think?!)

I guess the problem is something bridging to ground that shouldn’t be, but I’m damned if I can work out what and I’m running out of options! Any suggestions of what to check next? Thanks!