Ballast tubes and special “XX” tubes

Ballast tubes and special “XX” tubes

 TYPE
RATING
  USED AS
VOLTS AMPS.
OHMS
1A1 1.0 .50 2 Ballast for 2v battery operation from 3.2v dry battery
1B1 1.0 .36 2.8 Ballast for 2v battery operation from 3.2v dry battery
1C1 1.0 .745 1.34 Ballast for 2v battery operation from 3.2v dry battery
1D1 1.0 .24 4.17 Ballast for 2v battery operation from 3.2v dry battery
1E1 1.0 .48 2.1 Ballast for 2v battery operation from 3.2v dry battery
1G1 1.0 .42 2.4 Ballast for 2v battery operation from 3.2v dry battery
1K1 1.0 .55 1.8 Ballast for 2v battery operation from 3.2v dry battery
2 9.0 .300 30 Ballast for AD-DC filament circuits
3 128.0 .30 427 Ballast for AD-DC filament circuits
4 115.0 .40 287.5 Ballast for AD-DC filament circuits
5 115.0 .46 250 Ballast for AD-DC filament circuits
6 1.0 .685 1.46 Ballast for 2v battery operation from 3.2v dry battery
7 176 .3 587 Ballast for AD-DC filament circuits
8 132 .3 440 Ballast for AD-DC filament circuits
9 50 .3 167 Ballast for AD-DC filament circuits

 

Special Philco tube types

 TYPE
SUBSTITUTE
XXB 3C6
XXD 14AF7
XXFM 7X7
XXL 7A4
FM1000 No Known Sub