tedsorvino
Well-known member
Hi everyone.
I recently bought 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.
The whole device is based around tl072 op amps mostly (and a few ne 5532). A few vactrols (for switching purposes), along with a comperator and a few transistors are there too.
Could also be something with cleaning, hve tried with deoxit, nothing really changed, but it would be so much better if i could follow a valid schematic.
Thanks in advance
I recently bought 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.
The whole device is based around tl072 op amps mostly (and a few ne 5532). A few vactrols (for switching purposes), along with a comperator and a few transistors are there too.
Could also be something with cleaning, hve tried with deoxit, nothing really changed, but it would be so much better if i could follow a valid schematic.
Thanks in advance