Medium-Mu Triode
The 37 Vacuum tube is a three-electrode general purpose
tube for use in automobile receivers and in sets
operated from DC power lines. It contains a
heater-cathode which is designed for DC operation. This
feature together with that of general freedom from
microphonic and battery circuit disturbances makes the 37
vacuum tube well suited to mobile service and other
applications where complete DC operation is desirable.
Electrical Data
Heater Voltage ............................ 6.3 DC V
Heater Current ............................ 0.3 A
Preferred Substitutes ......................... 37A, 76