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> 2009
> Lot of 50 sanken STA471A npn darlington bulk
Lot of 50 sanken STA471A npn darlington bulk
You are looking at a lot of 50 pieces of Sanken part number STA471A. These are NPN Darlington With built-in avalanche diodes. They were pulled out of working equipment and are packed bulk in an anti-static bag.
My tube tester is a SECO 107A Dynamic Mutual Conductance Tester. Good is at 60, but all tubes listed as NOS or NIB will have tested over 100, have no shorts, leaks or gas.