Its big! Car audio amplifier...

[diyaudio]

Interesting amplifier, car audio is no longer a popular sport like it used to back in the days, this is not a typical everyday amplifier. (im to old to find value in justifying putting a amplifier like this in an everyday vehicle.

The power electronics section is the most interesting to me, those six toroidal cores are wired in series approximately 25 volts each capable of at least 30 amps easily through each winding, the small core looks like a LC filter to suppress large AC ripples on the 14.4 DC bus front end as a result of a massive currents involved during loud playback.

The amplifier section is nothing innovative in terms of today's standards, its just a class-d amplifier probably a clocked modulator. majority this amplifier is made up of a DC TO DC converter with massive heat-sinking surface area.   
 

[NiHaoMike]

The insides look just like a power inverter... Because that's what it is...

A lot of cost can be cut out (and efficiency improved!) by using a common 120/240V generator run direct off the engine, then just rectifying that and driving an IGBT power stage direct off the HVDC bus.

[AmmoJammo]

Here's another high powered amplifier I'm meant to be fixing... hmm...



I'm trying to source a replacement transformer... but failing that, what would you do?

[T3sl4co1l]

Niiice...   At least it was obvious enough...maybe.

Easy enough to desolder (actually, desoldering that pile of wire called a transformer is probably the hardest thing..), take off the windings and find the burnt spot.  Apply tape (preferably mylar or kapton) and put it back together.

Tim