Jackson, JX-3 Preamp. Power supply [traced]

PeteSignal · Post by **PeteSignal** » 26 Apr 2022, 14:47

Hello

This is a nice and rare rack mount tube preamp from the early 90's from Jackson. I have traced the power supply and created a schematic. Its just a simple linear supply.
I was thinking about reverse engineering the whole thing. Leave a comment if you want me to trace the entire thing. If I get enough interest Ill do it.

I posted a YouTube video about it on my channel:

Peace out.
Pete

ppluis0 · Post by **ppluis0** » 26 Apr 2022, 16:50

Hi Pete,

Of course will be interesting to have the schematic diagram to know how this unit was designed.

There is a couple of gutshots found on the web:

Looks as the PCB isn't too complex to extract a diagram:

upload photos

Cheers,
Jose

bmxguitarsbmx · Post by **bmxguitarsbmx** » 26 Apr 2022, 18:52

Nice pics! This scheme may be a good starting point for tracing.

bajaman · Post by **bajaman** » 26 Apr 2022, 19:33

Great preamp - a friend of mine used one of these way back then - nice Marshally sound

deltafred · Post by **deltafred** » 27 Apr 2022, 10:11

We're always interested in any schematics.

jmpj45 · Post by **jmpj45** » 07 May 2022, 19:01

Yes a schematic would be great.

jmpj45 · Post by **jmpj45** » 19 May 2022, 23:22

Any info on tracing the jx-3?

blackboarcult · Post by **blackboarcult** » 31 Jan 2023, 20:17

I rescued my old unit from my parent's garage and started tracing it.
I've only gotten this far, and will have to postpone the rest of it (outputs, switching, psu, etc) to next week, as I will need to properly gut it to check the traces thoroughly.
In the meantime, it is lying open on my bench, so if any questions, I'll be happy to oblige.
Cheers!