BTK5-120 by YOK amp help

[Deadly Sones]

Good afternoon,

I've NEVER seen an amp like this one. It has 2 damaged output sections. There are no board designations and just about everything important has been defaced. The amp is sold under the name OG Audio.

The output transistors seem to be IRF640As. Can I use IRL640As?

I've circled what I believe to be the drivers... no idea what they are though... any insight??

Thanks in advance!!

 

[Perry Babin]

The IRL are logic level and may not work. The IRF640N is used in some of these (Type 4, in part).

Is the IC on the single IC vertical board marked?

Are the ICs on the through-hole vertical board marked?

 

[Deadly Sones]

There does seem to be part numbers... but nearly impossible to make them out. Even after trying the grease trick. I bought a microscope. I'll come back to this afterward if necessary.

 

[Perry Babin]

Is the board with the DIP IC a crude copy (different layout) of the type 4 board with the 319, TL072 and 74HC00?