ECC81 12AT7 Lorenz Vertical Square Getter Fully Tested Pair Esslingen

Original pair of ECC81 Lorenz vertical square getter tubes.
Made in Germany – Stuttgart Esslingen factory.
Very early production run!

Fully tested with my AVO CT160 tube tester.

Tube No. 5
Ia = 11.5 / 8.5 mA
S = 7.0 / 6.0 mA/V
Heating current = 295 mA @ 6.3 VAC

Tube No. 24
Ia = 8.6 / 10.9 mA
S = 5.7 / 6.6
Heating current = 299 mA @ 6.3 VAC

Nominal values:
Ia = 10 mA
S = 5.5 mA/V
Heating current = 300 mA @ 6.3 VAC

No shorts. No Gas
Filament to cathode isolation for both tubes is excellent (more then 25 MΩ)!
 
Packed in a generic white boxes.