Two Tested Type 24A 424A DeForest / Philco Globe Balloon Audio Receiver Radio Vacuum Tubes  

Country of origin:   USA

Production era: 1920s-30s

Model:    24A  424

Manufacturer:  DeForest Audion / Philco

Type:   power 

Plate type:  round silver mesh / punched

Filaments:  standard

Base type:   engraved UY 5 pins

Getter flash: side

Glass:   clear

Stencils: excellent

Condition:  excellent 

Usage (estimate):  minimal

Carton:  NA

Quantity:  2

Please review the photos for more detail

Test results:

       Excellent balanced test results for Gm:   38 and 33

       For Gm, the suggested minimum is:  25

Shorts: None detected

For testing, a calibrated Military TV-7 tester was used

Compatibility: Suitable for vintage tube-based equipment, ideal for use in audio amplifiers, power amps, and general tube equipment

The tubes will be carefully packed to ensure safe shipping

Estimated delivery time within the USA is 3 to 7 business days

Standard shipping service is US Postal 1st class

Shipping is combined when applicable

Please feel free to contact us if you require any additional information