Hi:
If you go to http://www.manleylabs.com/techpage/Manuals.html
I think you will likely find a manual that details the procedure.
You might also look at http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1213370405 for my comments about specific issues with the Manley 50's.
If this does not get your answer, at the top of the first link, send your inquiry to EvaAnna Manley. She very regularly responds to general customer service inquiries. Customer Service doesn't get much better than at Manley.
If you go to http://www.manleylabs.com/techpage/Manuals.html
I think you will likely find a manual that details the procedure.
You might also look at http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1213370405 for my comments about specific issues with the Manley 50's.
If this does not get your answer, at the top of the first link, send your inquiry to EvaAnna Manley. She very regularly responds to general customer service inquiries. Customer Service doesn't get much better than at Manley.