Company of "The one and only", Nelson Pass.
https://www.passlabs.com/ & https://www.passdiy.com/ & https://www.firstwatt.com/

Here you find information eventually including schematics, pcbs or links to forum's discussions about various designs by Pass Labs.

If you get hold of one of the service manuals, always remember

"The service manuals are not DIY projects. You

will get an extra merit badge for navigating the

treacherous waters of any service schematic drawn

by Pass."

[Nelson Pass]

Don't trust mentioned voltage drops, bias values. Calculate them yourself to check!

Amplifiers

Preamps

Pearl Phonopreamp

Click here to go to the Pearl project main page

Aleph-L preamp

Click here to go to the Aleph-L project main page

Poweramps

Pass Labs

Amplifiers

Preamps

Pearl Phonopreamp

Aleph-L preamp

Poweramps

Aleph-30 power amp

Aleph-X power amp

F3 power amp - PCB Group buy closed

F1 power amp - PCB Group buy

F2 power amp - PCB Group buy

Speakers