I've come up empty on what values the power transformer has and I refuse to pay Mercury Magnetics 3 times the normal price for a transformer that won't fit and might not be the right one. The only markings on the transformer case are 'GA 5". The case cover style is an old Hammond style but Hammond says they don't know what it is. The Amp seems to be an early Skylark transition from a Les Paul Jr. I intend to lovingly restore this amp and use it in my recording studio. I've restored many classic amps in my time and never have I had such problems finding a transformer. Does anyone know what this transformer is?