Sarkes Tarzian M-500 Silicon Rectifier Conversion Kit

Found this vintage Sarkes Tarzian M-500 silicon rectifier conversion kit. It's a cool piece of radio history from Bloomington, Indiana. These were used back in the day to upgrade tube-type rectifiers to silicon. The box has some wear but the labels are still clear with all the electrical ratings. Perfect for a collector or someone restoring old tube gear. Sold as-is since it's a vintage electronic part.