Triode
.5 amps
The Silvertone 12A Vacuum tube is a triode power tube. It requires a UX-Base four pin socket.
The 12a tube is used
in Garod EA, Remler-co Infradyne, Steinite 991, Steinite 992, Steinite 993, Workrite 17, Workrite 37,
Atwater 61 and Atwater 61C radios amoung others.
The 12A is NOT the same as the 112-A! The 12A draws a .5 amp. The 112-A draws a .25
amp. Now to make things more confusing, a CX112 is the same as a 12A tube. It also draws a .5
amp. So a 12-A and CX112 are the same. A 112A or CX112-A is the .25 amp version.
Electrical Data:
Heater Voltage .................... 5 V
Heater Current .................... 0.5 A
Preferred Substitutes ............ 12-A, 112, CX112, D412, MX112, UX112, X112