02-26-2013, 07:14 PM
Try contacting these links/people, they may have some info for you:
http://www.alltubetesters.com/
http://www.radiolaguy.com/info/tubeTesterRest.htm
http://www.atlantatubeamp.com/
http://www.alltubetesters.com/
http://www.radiolaguy.com/info/tubeTesterRest.htm
http://www.atlantatubeamp.com/