I got an AC transformer from an audiophase radio clock which had this number on it 0208037930. idk if thats important or not. reguardless, it has 4 wires coming out of it, two for each coil. the ive already identified the primary and secondary and primary coils. i wanted to find out how many volts i should input and how many ill get for an output. the casing around the iron core said "Starlite SL42-26A2" i tried searching it up but nothing came up.How can i identify the input and output voltage? also, would it be safe to plug it into a wall?