Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Colas LeGrippa on December 05, 2024, 07:39:01 pm

Title: Mesa Boogie QUAD preamp
Post by: Colas LeGrippa on December 05, 2024, 07:39:01 pm

Hi,


Juste came in a quad preamp from Mesa Boogie wired for 220V. I can't find the power transformer wire colour code in the schematics. I have to wire that thing for 115V. Tanks for information


Colas

Title: Re: Mesa Boogie QUAD preamp
Post by: Latole on December 06, 2024, 03:26:57 am

Can't find any power supply schematic

Look and read here , it is for a Road King . Are colors are same ?

https://tonymckenzie.com/mesa-117v-to-240v-conversion-tad-transformer-review.htm

Title: Re: Mesa Boogie QUAD preamp
Post by: JPK on December 18, 2024, 07:53:40 am

Should be able to verify primary tap with multimeter set to ohms.

Title: Re: Mesa Boogie QUAD preamp
Post by: joesatch on December 20, 2024, 03:36:30 pm

I have the Studio Pre pinouts. It's very similar to the Quad but not sure if they use the same transformer.