6AC7…6X2
US nummering volgens de Radio Electronic Television Manufacturers Association.
Heater Voltage 6 Volt
12AB5…12S7
US nummering volgens de Radio Electronic Television Manufacturers Association.
Heater Voltage 12 Volt
US nummering volgens de Radio Electronic Television Manufacturers Association.
Heater Voltage 6 Volt
US nummering volgens de Radio Electronic Television Manufacturers Association.
Heater Voltage 12 Volt