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.
Item Tag: 01A
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Matched Pair RCA Cunningham CX301A Globe Vacuum Tube Amplitrex NOS New In Box
Both tested NOS and matched on an Amplitrex AT1000 with the following results (as photographed): Tube 1- 113% ip 100% gm Tube 2- 106% ip 100% gm