Dear @jalbertwebsterjr : All the Spectral models have a unique Spectral topology where between other things the unit is tunned at each single stage in the whole circuit boards.
So with out schematics is a truly hard task try to fix it and been Spectral rthe only one to fix it then you are in Spectla hands. Even if you touch the boards ( at any place ) and you send to Spectral they will refuse to fix it.
Btw, transformers could be a hum source and the Spectral ones were custom made.
R.