Hi, I don't have any documention but is is a Magnavox. It's identical to the one I had back in the 80's.
This one has the little 'ol 6BQ5 single ended stereo amplifier. It's also the amp that you can squeeze a lot more out of according to a DaveG thread around here somewhere.
You will notice that it doesn't have a speaker balance control but if you remove the bass control knob, you will find that the shaft is hollow for a small screwdriver. This is the speaker balance control for this model. It is not on the amp nor does the amp have a hum balance pot. This is the 8601 amp off the top of my head.