DIYRE EQP5 Passive Equalizer Kit - 500 series SS Pultec

 Cool.  That sounds like a fun project!  They are in the mail, so you should have them later this week.

Brad

Guitar is your friend using them on the 2 bus or where ?

He's just started using them on this and that, just built them.  I guess that's probably where a lot of people are since these just came out.

Seems to me like this fill the void of something like the Eisen LilPeqr or whatever that thing was called a few years ago.

Looks a lot like a pultec without the mid band to me.  Hmmm.

So, I just read that Joel from Rascal Audio had a hand in designing these. Interesting.

This is the comparison between the SL1731 and BradM Rogue 5 

www.dropbox.com/sh/u1xehaa3uti2hmu/AAALjjvmTmqxfIj8QvBmBErla?dl=0

Jerome

Ya prefer the rogue here too, would like to here the blue as well, like on acoustic guitar.

Just as a note, I put the scope on these to find out how the IC's are acting when the DOA circuit is engaged. What I believe is that IC1 is being used to unbalance the input, IC2 is your makeup gain.

What I've done is put an OPA1642 in that spot and I've left BradM 's Rogue 5 in there. I just feel that for these EQ's that opamp compliments the circuit the best. I'd highly advise swapping out the IC1 for a newer generation opamp like the OPA16XX series, it makes a massive difference. 

Hopefully this helps anyone decided how to customize their EQ's, for me, on the mix buss this was the best configuration I have come to. I do plan on trying out the OPA1602's and OPA1612's as well, and of course I will update and give my opinions there as well. 

As a side note, this circuit can do some really amazing stuff just running on the IC circuit. If you do decide to only go IC, again and I can't say this enough, put some newer generation opamps in there, it's the biggest difference maker thus far. The DOA section does really give you a nice punch and silkier top, but the IC circuit is plenty good enough to get started with. And don't forget, get jsteiger 's 2503L's!!!! They sound incredible in this EQ. 

-Jerome

Thanks Brad, 

I'd gotten an email from Peterson on that already, but like I'd said when I scoped it out I quickly learned that IC1 is used as a receiver to unbalance. I had originally thought that for some reason IC2 was still in the circuit, but that they may had been using it as a buffer by dropping it's gain into the DOA section, but, that's not the case. IC2 is completely decoupled from the circuit when the jumper is placed into FE mode. 

Still though, by IC1 using an opamp to unbalance the signal, it's pretty important to put something in there that is more modern and better IMO. I've ordered some OPA1642's, 1612's and 1602's to see which I like the best. Those are my favorite IC opamps so far. I did order some SOIC to PDIP PCB's to make things tidy instead of using an IC socket, just not very reliable, but can work in a pinch. 

Jerome

I haven't actually, and that's really only because I currently just own a pair of them. I've considered doing some more, but I'm really leaning toward trying to experiment with the Colour Palette/modules for busses and individual tracks. I still think there is a massive void in taking that product to another level and I'm doing some talking with designers to come up with ideas to take the Colour idea to another level. 

But, back to the EQ. 99.9% of what I mix is cut here in Nashville, very rarely do I get sessions from anywhere else. The guys here almost use a preset in how the track every instrument or vocal. There is a sound that everyone is aiming to get when they're cutting and it's great because it's so pure that extremely little corrective EQ is needed. The great thing about these EQ's is that the top-end is very sweet, you can add it for days and it just keeps enhancing and helping rather than correcting. 

What I love about them is the punch in the low-end. The Kush EQ had a way of using the low cut and low boost to create something similar, but these do it in a much simpler and musical way. I like them set to pretty broad, and also a good way for helping them to maximize your punch is to HPF ITB before you hit them, then you can make it instrument/vocal specific and the filters do the most work for you. 

For me to trust them on my mix buss is something I wasn't really expecting.... But, somehow, they've created an EQ that is super simple in design and have chosen not to put a ton of extra components in the signal path, and that really is what makes these EQ's stay pure in tone. 

Just as an example of how I would use these for lets say female vox. I would roll off up to around 150hz before I hit the eq, then I would use the eq to add weight, punch and sheen. Then I'd knock the hell out of it with a comp/limiter and call it a day. That's as simple as you can get and it's going to stay pure. 

Long answer, but I answer questions when someone ask's. 

Jerome

Thank you for the informative reply, jeromemason!

I'm looking at these pretty hard right now. Also DIY Rec also just announced an optical limiter for the 500 series and are taking user feedback while they finish up the design.

I just got a Lindell PEX-500, just one, so I am using it on tracks and it sounds fantastic! It has a few more options than the DIYREC PEQ5 in terms of frequencies. I find it very useful and very toneful.  It has transformers on input and output, along with a 2520 style op amp.  I find it leaves plugins well behind.

This stuff is getting me excited. I've always loved ITB Pultec plugins, but the hardware is just much more gratifying. Also at these price points, it's hard to argue too much.

Not that I think any one here need to watch this, but maybe some one wants to any ways

Kickass, dude! Nicely done. 

Interesting.  I have literally never seen a mica cap that looks like that, who knows.  Yeah I would assume VR on the pcb means what you said also.