Looks good, feels sturdy, and works perfectly.
RCA 5U4GB Rectifier Tube, Black Plate NOS, Set of 3
Product Details
RCA 5U4GB Rectifier Tube, Black Plate, NOS
Set of 3
NOS stock.
These are new and unused, but I tested their operation with audio equipment for this listing. They are in good working condition.
Daily Cleaning: Use a soft brush or damp cloth to gently wipe away dirt. Avoid harsh chemicals. For mesh areas, use diluted mild detergent and a soft brush.
Drying: Air dry in a cool, shaded place after cleaning. Avoid direct sunlight or high heat, which can cause fading and glue deterioration.
Storage: Stuff with paper to maintain shape when not in use. Store in a dry, ventilated area to prevent mold. Rotate between multiple pairs to extend lifespan.
Usage Notes: Designed for basketball. Not recommended for hiking, long-distance running, or other specialized sports where different performance features are required.




