Passive EQ + GSSL. Great 2-buss insert!

[Coldsnow]

Sorry I meant the 33n is the 20K hi cut and the second 33n is the 18k hi cut. Is this correct?

 

[synthi]

must be an error, using two 33n caps will give you the same frequency...

I think first cap would be 22n or so.

Synthi

 

[Coldsnow]

It looks like the first 33n stays in the cuirut and the second then would go together with the first in parallel to make the 18K cut. Maybe?

 

[Coldsnow]

Also, the transformer looks like a 2:1 transformer, is this correct? Would any 2:1 input transformer work?

 

[Coldsnow]

I take that back I see that it is 1:1 and is an output trany by design?

 

[synthi]

It looks like the first 33n stays in the cuirut and the second then would go together with the first in parallel to make the 18K cut. Maybe?

YES!!

Synthi

 

[emx]

the eq circuit works without the inductors? That could save me some frustration on the build, or am I looking at it wrong?

 

[gyraf]

It's a limited version of the eq - but yes, this works without the inductors (whoe's purpose is bandpass filtering, which is excluded from this circuit)

Jakob E.

 

[ilfungo]

Ciao
I have 2 Edcor XSM 10k:10K is possible to use on GSSL?
Some mod?
Thanks

 

[MikeClev]

I think a 10k:10k would be suitable for GSSL inputs, but not outputs.

 

[Robbydt]

Hi, I know its an old topic but i hope someone can help me.

I built this EQ a few days a ago and overall it works fine but the low cut didn't work. I studied the schematic and I removed one of the 10K resistor connection at the output. (near 220n capacitor). Now it seems to work great. (I attached a picture)

Now my question: Is this a mistake in this schematic or is there a second fault on my circuit?

 

[jensenmann]

The connection between the 68nF cap in the low cut circuit and the 10k resistor below is basically shorting the complete cut section. So the drawing is wrong.
On top of that I´d recommend to increase the output cap at least to 1uF. If you´d plug that passive circuit into an unbalanced 10k line amp then the 220nF output cap would set the lower -3dB frequency to 70Hz. That´s not good for a Pultec and would be even worse if you´d plug it into a micpre as a gainmakeup stage. 220nF is ok if it´s followed by a high impedance gain stage, e.g. a tube amp or a FET input opamp.