for XO's and amps, power supplies -- can be found on their site at:
http://www.marchandelec.com/articles.htm
here's the assembly manual for the XM44:
http://www.marchandelec.com/ftp/xm44man.pdf
obviously some of this stuff (like the XM1) is quite dated
a link to their sound-card based function generator was placed on rec.audio.tubes:
http://www.marchandelec.com/fg.htm
http://www.marchandelec.com/articles.htm
here's the assembly manual for the XM44:
http://www.marchandelec.com/ftp/xm44man.pdf
obviously some of this stuff (like the XM1) is quite dated
a link to their sound-card based function generator was placed on rec.audio.tubes:
http://www.marchandelec.com/fg.htm