Used for many classic radios. I tested these tubes on my Hickok TV7 tube tester. The minimum workable number for this tube is 18. Lots of life in both tubes.
Item Tag: 201A
FIVE 201A Radio audio TUBES that test good on a calibrated TV7 tester GUARANTEED
Here are FIVE tested good for emissions 201A tubes by various manufacturers. I have several hundred of them. Get your 1920s radios working with these tubes.