try asking the guy at vintage tube services. i have some of his tubes on the way....he offers a money back guarntee. something i have not found from any of the other tube dealers. i found his site through another post on audiogon. the post stated that you really never see his tubes for resale here....interesting point.
i know it did not totally pertain to your question....but a new direction.
i know it did not totally pertain to your question....but a new direction.