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A schematic, or schematic diagram, is a designed representation of the elements of a system using abstract, graphic symbols rather than realistic pictures.

FBT M12X4 preamp-mixer problems

Hi everyone. I recently found a used FBT M12X4 preamp unit and apparently there is a problem with one of the 2 channels (tested in every input).
I have experience on repairing stuff but i can’t find any schematic or service manual online.
Does anyone have the schematic for that unit or any idea of any similar fbt device.

Early Rane SM26 schematic

Hi All... I am new to the group and hope someone may be able to help. I have an early Rane SM26 on my bench and in need of a schematic. This unit does not use 7815 type voltage regulators but does have the power supply integral to the unit. Since Rane was bought out (by In Music Brands I think) information has been a bit more difficult to obtain.

Fixing UA La-610 Compressor (need schematics with voltage points)

Hi guys,

Like the title says, I got one of my two LA-610 who doesn't compress anymore.. the action faded over a few months.
I tried to change the tubes and even exchanged the opto cell with the other LA-610 and it did no good.

So I guess a cap or a resistor failed.. I'd need some guidance and some precise schematics

Thanks in advance.

PreSonus Firestudio Project - Needs power supply schematic

Asking on behalf of a fellow member on another electronics repair forum. He seems to have a bad a resistor that is some type of 1/4 resistor that is right beside the bridge rectifier. Obviously, these new types of schematics are tough to come by... However, the year of the device is 2007 and all that is really needed is the value of this resistor.

AMEK 9098 Dual Mic Pre schematics (AMEK 9098 DMA) Schematics looking for


Hi all ! does somebody have the AMEK 9098 Dual Mic Pre schematics (AMEK 9098 DMA)
(without EQ ).

The Rack have not EQ but have a DI INPUT, I know the schematics is a little bit different.

Thanks for your help.

Please if you can mail me at this address if you have it :


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