• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Hybrid amp Model IF-AD03

I just acquired this amp from a neighbor who says it is not working and wants me to repair it, if I can. It powers up but seems to make some clicking noise. I checked the DC offset and the AC ripple and they look okay as this unit has transistors in the output.
After opening it up it appears that someone has worked on it, making any repairs on it difficult if not impossible as you do not know what was done.

Does anyone know where I can get a schematic for this unit and at least give it a shot to repair it. I am assuming the tubes are good as I do not have a tube tester and trying to find someone who does is like pulling hen's teeth...

Any help is appreciated. Have a Happy New Year to all.

Cheers Wayne