Sorry  if this a stupid question but here it goes.  I have a transformer that I can not find any info on   PN E190246 I don't know what it is rated at or if it will even work for amp building.  All of the ones I've seen in my little 10w practice amps have 3 output wires IE: red/black/red or some combo that ALWAYS has black in the middle.  But this E190246 has 4 output wires 2 yellow  and 2 blue. Will this work and how is the correct and safe way to find the ratings? Also how should I connect this?