Quad 8 AM10 DOA discrete op amp – blank PCB

Quad 8 or Quad Eight? were at one time one of the biggest high end full format console manufacturers in the USA around the 1960’s -1970’s. They had engineers on their side from the legendary Electrodyne. 

Quad eight consoles were in some of the most high end studios across the USA but quite a few were in Hollywood. They had a good business & name in the dubbing & movie side of things. Well known for having a big thick sound.

Sadly for Quad 8 fans, API over took them in the market… at least for recording studios.

Ask in the right places & people will rave about their pre amps being as good as Neve’s & API’s, some might even say better. 

Quad 8 eventually became quite unknown among engineers however recently their name has become 

The AM10 is a discrete opamp developed by quod eight for their consoles. 

Like all DOA it can add some discrete analog goodness in the right circuit. 

This particular layout was made for the API 2520/990 format so easy to use nowadays. 

Estimated build time – 30-60 mins

Skill level – intermediate (small tight layout)

Tips – The 4R7 resistor might benefit from some heatshrink on one of the legs as is a short risk.

10k x2

62k x2

3k6

1k5

330R

150R

7R5

4R7

220p

100p x2

10p

BC560 x4

BC550 x4

2n2102

2n4036

1n4148 x8