These are factory tested at real world operating voltages and matched for current and transconductance. You will not be disappointed in the performance of these tubes.
They are burned in for 24 hours and then platinum matched by the factory at 250V plate, 250V screen and -8.6V bias. Insist on factory platinum matched tubes for best performance.
They are shipped in factory retail boxes and labelled with factory matching statistics as shown.
All tubes carry the 90 day factory warranty against defects from date of purchase.
Please email with questions and visit my many other tube auctions! Compare these tubes to sets costing $190 and up.