I've recreated the SL613 Test jig!

[mike_signo]

Hello everyone!
After many many sleepless nights tracing the circuit of the SL613 (the SSL Test jig schematic has intentional errors) I'm happy to say that I've managed to recreate it in a 3U rack mounted form.
I've tested it today and all the fuctions of the original test jig work perfectly (4000/6000, Mono, Dual line and stereo channels supported)!
I need to add the fader module to allow it to work with ultimation consoles, the original 613 missed this feature as well.
Some kind of ultimation fader simulator called 354/613 was used to test ultimation consoles, there is very little information about it but it shouldn't be too difficult to recreate.
Does anyone have any information about this very rare ultimation fader jig?

All the best
Michele

[mike_signo]

Here's the link of some pics.

https://photos.app.goo.gl/jsnXnLozwBA9jktW9

[Clip6]

Nice. Looks awesome.

[horizonsound]

Excellent work!

I have some low res photos of the Ultimation test jig.
If you message me your email, I'll send them through.

Anthony.

[matt]

Wow - this looks like quite some work - well done

[Chris Simon]

https://forum.sslmixed.com/index.php?topic=1681.0

[oyanliz]

Amazing job!! I saw your job on instagram! Well done!!

[mike_signo]

Thanks Everyone!!!
The small amount of components present on the 354 test jig (Thanks Chris for linking that thread!) makes me optimistic that It should'n be too difficult to recreate.
Looks very simplified compared to VCA fader itself.

I can see two of the same power connectors used for the SL613 Jig, they are likely linked to together just to make it easier to use the 613 and the 354 with a single psu.
There's the IDC connector with presumably goes to the VCA card on the channel itself.
They used a rotary switch with discrete steps instead of a pot for the fader, there are 5 blue burns trimmer which I presume are used to finetune the individual attenuation levels of the rotary switch (fader).
The Vca switches this fader in an out compared to a fixed value (photo is quite blurry but I looks like it says +10dB).
I don't know how the total recall swtich is implemented, I'll check my documentation to find out!

I'm very excited to get it working!
All the best!
Michele

[Chris Simon]

Sorry, should have sent this schematic, too.

[mike_signo]

Thank you!!
This will save me a lot of time!
I'll proceed immediately with redoing it in Kicad and printing a board for it!