Look first at the Jeff rowland web site in the section for classic amps:
http://jeffrowland.com/ClassicAmps.htm
You should be able to download documentation for the amps you are interested in. If you do not find voltage conversion information, you may need to contact JRDG.
http://jeffrowland.com/ClassicAmps.htm
You should be able to download documentation for the amps you are interested in. If you do not find voltage conversion information, you may need to contact JRDG.