Just putting this out here as an FYI.
I know TC Tubes has a matching service for the Tung Sol KT-120 this could be another alternative. When I had corresponded with Jim McShane here is what he said about the matched Tung Sol KT-120s he sells.
"All tubes (even new) are carefully tested on my AVO
CT-160, TV-7 or B&K 747 testers. Power tubes are
tested and matched at real operating voltages, not
just with a tube tester.
The KT-120s are run in for at least 24 hours then tested at
465 volts on the plate and screen with -50 on the grid. They
are tested for grid current ("gas") and shorts while blazing hot from the match rig."
I hope this helps