I assembled this pair from two highly regarded ebay tube sellers for a project that was never started.

Tube 1: Manufacturer: Philco

TESTED STRONG

Type: 47 Balloon Globe

Plate(s): Black

Getter: Inverted Cup

Micas: Two

Silkscreen: 90%

Engraved Base: Yes

Visible Codes: F1

Tube 1: Mutual Conductance: 2000gm where 1260gm is minimum

Thoroughly Tested for Gas, Shorts, Leaks, Noise and Mutual Conductance(where applicable).

Tube 2: Manufacturer: Philco

TESTED STRONG, DATE CODE: 1L

TESTED on HICKOK TB-7

Results: 56

Minimum: 50