Author Topic: SSL QUAD BUSS compressor not behaving SOLVED  (Read 1285 times)

Matt Sartori

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SSL QUAD BUSS compressor not behaving SOLVED
« on: December 29, 2013, 01:09:52 AM »
Hi Everybody this time I am stuck:
I am working on a 4064E console that has been recently recapped but needs quite a bit of attention still.
the main compressor jumps quite a lot when switching ratio and / or threshold while audio runs through it and ...it does affect the audio when not switched in!

any suggestions?

Mattia.

sintech

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Re: QUAD BUSS compressor not behaving
« Reply #1 on: December 29, 2013, 09:58:51 AM »
If it's effects all 4 sides, then the 026's cards are probably not the issue.. but the one thing global to them.

Do you have a spare time constants card 027 to try?


You should put the 027 on an extender and check the side chain through.

sintech

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Re: QUAD BUSS compressor not behaving
« Reply #2 on: December 29, 2013, 10:12:05 AM »
On the 027 schematics look at points A, B and C

And IC's T1, T2 and T3

kilmister

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Re: QUAD BUSS compressor not behaving
« Reply #3 on: December 30, 2013, 08:17:28 PM »
Perhaps there's broken ratio/threshold/release switch?
Our console had bad ratio switch that didn't make a connection anymore and comp went quite crazy.

-Paavo
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GabrielO

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Re: QUAD BUSS compressor not behaving
« Reply #4 on: December 30, 2013, 10:39:19 PM »
i had a similar problem too with our ratio switch on the quad comp., worth trying to clean it or change it if you have a spare...

Matt Sartori

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Re: QUAD BUSS compressor not behaving
« Reply #5 on: January 01, 2014, 04:52:56 AM »
thank you guys!
I am gonna try all the above!

Mattia.

Matt Sartori

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Re: QUAD BUSS compressor not behaving
« Reply #6 on: January 20, 2017, 10:11:42 PM »
Ratio switch needed replacing.

done!

Matt Sartori.

RoyMixer

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Re: SSL QUAD BUSS compressor not behaving SOLVED
« Reply #7 on: February 03, 2017, 04:16:54 PM »
Hi!

Where did you source a new ratio switch?
best
Roy

Matt Sartori

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Re: SSL QUAD BUSS compressor not behaving SOLVED
« Reply #8 on: February 03, 2017, 10:36:30 PM »
it's a normal Elma, I can't remember what type it is as it was long time ago, but it's something you can get from Farnell or RS

something like this:

http://uk.farnell.com/elma/01-1433/switch-4-pole-3-pos/dp/1876080

Matt Sartori.

oyanliz

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Re: SSL QUAD BUSS compressor not behaving SOLVED
« Reply #9 on: September 25, 2017, 05:37:53 PM »
Hi,

Should be the rotary switch for ratio, release... shorting pot? Or must be non-shorting?

I see in the ELMA datasheet shorting and non-shorting models, so...

Regards

Oihan

oyanliz

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Re: SSL QUAD BUSS compressor not behaving SOLVED
« Reply #10 on: January 03, 2019, 03:15:40 PM »
Hi,

Does someone know if the Elma Type 01 rotary switches must be shorting or non-shorting model?

Thanks.

Oihan

oyanliz

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Re: SSL QUAD BUSS compressor not behaving SOLVED
« Reply #11 on: January 10, 2019, 12:57:42 PM »
Hi all,

I have been measuring an ELMA Type 01 rotary switch (attack switch from the quad buss compressor) with a good multimeter (I have a cheap ona, but also have friend with good multimeter  ;D)

I have been able to check continuity between positions, so the ELMA Type 01 rotary switches installed in the console are "Shorting" models (ratio, release, attack, oscillator frecuency selector...).

Regards.

Oihan