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.

I have a analog APB Dynasonic Spectra t24i that is a great sounding board but has developed an issue.  The right channel no longer returns any sound on any of the 24 channels.  Solo and all the Aux channels are perfect.  I've cleaned ribbon cables and replaced three fans in it.  It was dropped by the delivery company hard enough to crack the plastic on the side.

hi there everyone. i recently picked up this old mixing desk for a good price and ive been wanting to try and get it up and running and see what it sounds like. my first step is that i need to get a 4 pin power supply cable to power the unit and wanted to see if anyone knew exactly what voltage and everything something like this would need.

I got these speakers from a friend but the wires dont connect, how should I connect these wires? Also i have an audio interface with 1 left output and 1 right output (both 1/4 inch jackplugs).

I have this mixer but the power connector has come off on the back and no idea where the wires solder back to the power connector so if anyone knows how to solder the connector and what colour goes to each pin i can then repair the mixer 

Greetings,

I have an older, used, "patent pending," Shure 545S Series 2 (pistol grip) microphone, and I'm gradually fixing it, having first reassembled the switch in the handle section.  I do get sound from the mic, but it is a little on the quiet, "hollow," and less low-frequency side.  I'm using it as high-impedance.

I've got 4 Accusonic/Show amps (2 x PSA-3900, 2 x PSA-31500), all four of them were working in all modes (stereo, bridged, parallel/mono). The following day I was testing them out and all of a sudden all four amps only work in bridged mode but not stereo mode or parallel/mono mode. Has anyone ever seen or heard of this before?

Hey guys,

Hi all, 

first of all please sorry for my english :) 

Yesterday I realized that the MIC input knob doesn't work with the values under the "off" selection (beetween +20 and +50).

After unmounted it I've seen that a cable is desoldered but I've got no idea to where he was soldered...

Any tips?? possibly with a photo since I don't have great electronics skills :D