Well seeing as Golden Tube has disappeared from the face of the earth you might want to try the "unofficial" golden tube mailing list at http://golden_tube.listbot.com Maybe someone that list could point you at a supplier. Also there is the possibility of buying a used SEP here and cannibalizing it for parts. Just a thought. Good luck.
Golden Tube: need Schematic & Parts.Help
I have a Golden Tube Sep1-se preamp that has gone kaput. My tech says it needs a new power transformer. He said if he had a schematic it would help for a possible replacement. Can anyone help with a source of parts, replacement transformer, and schematic. Thanks. Jeff