500 Series YannLu Audio EQ-500 (Harrison MR replica)

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Actually there is no output transfo in the original MR4 channel strip.
I chose to make the perfect replica with the line driver balanced output.
 
Hello,

Now there are 2 versions of the EQ-500 :

- Harrison MR4 replica : Mid range from 400 to 8000 Hz
- Custom version : Mid range from 200 to 4300 Hz

Mouser BOM : https://www.mouser.be/ProjectManager/ProjectDetail.aspx?State=EDIT&ProjectGUID=a3df64f4-33ef-40b3-837d-348ba20aea6e

Alternative provider for the 4x C50k frequency pots (out of stock by Mouser) : 
https://www.arrow.com/fr-fr/products/ptd904-2015k-c503/bourns

Here is below the upgraded Build Guide for EQ500 DIY kit.

For pricing and purchasing : [email protected]

Cheers.
Yann
 

Attachments

  • YannLu EQ-500 build guide.pdf
    1.9 MB · Views: 22
I just ordered my second EQ with the Mid modification. I’m extremely happy with these and can’t wait to have it in the rack! Thanks Yann.
 
Hello,

I upgraded the EQ-500 (electronic balanced output circuitry made with a single DRV134).
No double trace scope needed anymore !

Prices (excl. shipping) :

DIY full kit : EUR 280
DIY partial kit (PCB, frontplate, knobs) : EUR 150

The Mouser project for the partial kit:
https://www.mouser.be/ProjectManager/ProjectDetail.aspx?State=EDIT&ProjectGUID=1f729371-fd33-42d2-9754-fb7dc05b2d31

Contact me for purchasing : [email protected]

Cheers !

Yann
 

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