Here I would like to contribute the material for amp that I've been using for years.
For 20 years of bass guitar play I've played lot's of different amps but this one served me so well and I was really satisfied.
Just to say I always admired the players who used Trace Elliot gear and I was amazed by it's versatility and sound I was getting from this little "built like tank" amp. I was using this one for blues, funk, hard rock and even rented few times for all night gigs of Heavy, Death, Thrash metal. Never had a problem with it and never let me down.
Sadly I have sold this amp cause I've been offered a good price for it, but I have saved a loads of documented material so I could build one for my self again!
I know some would say that GP7 series were crappy and cheap but from my experience this amp had survived all "horrors" of gig using each weekend and more. From spilling bear to heavy overload, electricity cut-offs and more, and honestly never broke down, just cleaned out and ready for next gig! This particular one was built in 95 and I bought it from a guy who was using it for playing keyboards and "loud as hell" folk music...imagine the torture.
From the moment I saw it on my friends garage I was amazed that amp survived that kind of signal torture from keyboards and hours of clipping. And I said if this has survived that long it may survive anything and it's still working some 60km from my home town with owner who plays metal!
Enough personal history! Sorry.
I've had traced the Power amp section pcb and redraw it in vector based program.
Pdf file contains the pcb, component layout, and the measures for the aluminum heatsink.
I have scanned 2 other pcb's for preamp section + EQ but I've been lazy to redraw it.
My main idea was to rebuild this amp as a head version in 2U rack enclosure.
Much space is needed for the 150W power supply toroidal transformer.
I hope that soon I'll have time to redraw whole project with enclosure cad presentation so it could be ready to build project.
Unfortunately, I don't have the original schematic but I have found loads of similar Trace models and it wouldn't be hard to compare some of the 7 series models. Here are the link for some free Trace Elliot schematics - http://www.britishaudioservice.com/trac ... stru.shtml
Basically many of the Trace Elliot GP7 series are MOSFET in design and the principle is the same just different power amplification ratings.
I hope this thread would stay alive enough to be completed for people here who would be interested in this kind of project!
Guts in next post!
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