hifi engine

Somebody knows this appliance?

Hi all; i'm from Chile and has acquired one micro component with Amplifier - Deck and a Tuner, (aged in the 80's. The brand is unknown but the component are all made in japan; the only common thing in all of there is the writing of: premain amplifier. Searching the web, i'm see this same components with differentes names in Europe, and Latin America.

The brands i see are: EM-KAY TAA-33 - Electra TAA-33 - Europhon Milano TA-88- Palladium Microline 2000. If somebody has the specs and the diagram of this i'm really appreciate.