Two Tested Type 71A Hytron / Philco Audio Receiver  Power Amplifier Vacuum Tubes  

Country of origin:  USA

Production era: Estimate 1930s

Model: 71A

Manufacturer:  Hytron

Type: power

Plate type:  silver with copper rods

Filaments:  hanging V

Base type:   UX 4 pins

Spacers:  one

Getter frames: dimpled foil

Getter flash: circular side

Glass:  clear

Stencils: one very good, one no marks

Condition:  excellent, minor variations

Usage (estimate):   nominal

Quantity:  2

Please review the photos for more detail

Test results:

       Excellent strong test results for Gm:  76 and 74

       For Gm, the suggested minimum is:  

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 day

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