Hi,



I do have FRT-4 phono preamp - previous owner (could be like 30+ yeas ago) did "improve" it a bit since this time preamp is not working.
I was able to fix (this was easy) wires related to source selection (this was also destroyed) - but looks like I stuck with toroidal transformers wire connection.


Way to many wires and no idea where they should be connected,

Solid white wires should be linked to the ground - this is what I know.
But other wires are hard to guess - if you have access to this preamp can you make ultra detailed pictures so I will know what and where to connect?






Regards Chris

Firstly, welcome Chris.
Hope things are well over your side of the world.

Try this darklanternforowen.wordpress.com/2021/01/01/fidelity-research-frt-4-mc-cartridge-transformer/
or perhaps jerm has some better pics.

I have Dad's FRT4 at my house, I'll open it up and take some photos when I get a chance. Although I doubt they will show much more than what you can see in the photos above. From memory some of the wires are tiny and it would be very difficult to trace.

www.jeremyyoungdesign.com