SIXTYNINER

Re: 500 Series YannLu Audio EQ-500 (Harrison MR replica)
« Reply #40 on: March 13, 2018, 06:37:24 PM »
Hello , the Harrison MR replica Include original Harrison in-out transformers ?
>>" 1 Picture say what billions words cannot "<< - >>"SMD Kill the DIY STAR"<<
Why in the  forum  if no share


YannLu

Re: 500 Series YannLu Audio EQ-500 (Harrison MR replica)
« Reply #41 on: March 14, 2018, 04:13:19 AM »
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.

YannLu

Re: 500 Series YannLu Audio EQ-500 (Harrison MR replica)
« Reply #42 on: March 15, 2018, 10:23:13 AM »
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
« Last Edit: June 02, 2018, 04:27:45 AM by YannLu »

Re: 500 Series YannLu Audio EQ-500 (Harrison MR replica)
« Reply #43 on: March 15, 2018, 12:20:02 PM »
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.

YannLu

Re: 500 Series YannLu Audio EQ-500 (Harrison MR replica) New
« Reply #44 on: November 29, 2018, 09:41:14 AM »
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
« Last Edit: November 29, 2018, 10:04:36 AM by YannLu »