Larry, I had been planning to try Ken Rad and am considering purchase from ebay below. Is this type of tube what you recommend?
http://cgi.ebay.com/VT-231-6SN7-GT-KEN-RAD-BLACK-PLATES-NOS-6SN7GT-CL-GLAS_W0QQitemZ110334288862QQcmdZViewItemQQptZVintage_Electronics_R2?hash=item110334288862&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50
http://cgi.ebay.com/VT-231-6SN7-GT-KEN-RAD-BLACK-PLATES-NOS-6SN7GT-CL-GLAS_W0QQitemZ110334288862QQcmdZViewItemQQptZVintage_Electronics_R2?hash=item110334288862&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50