Brans cross-lists in same group. Similar Section 1 (mu=64 vs 68) and Section 2 (mu=5.4, ra=750). Octal (8BD) vs Novar (E9-75) base -- different pin topology, not a drop-in.
Brans cross-lists. Noval base. Similar high-mu/low-mu structure. Different base topology.
Electrical Specifications
Section 1 — High-Mu Triode
Absolute Maximum
Anode Voltage (max)Max DC Plate Voltage330V
Anode Dissipation (max)Max Plate Dissipation1.5W
Cathode Current (max)Max Average Cathode Current22mA
Heater-to-Cathode Voltage (max)Max Heater-Cathode Voltage200V
Notes
Dissimilar dual triode: Unit No.1 (high-mu, pins 8/9/1) is a small-signal triode (mu=64, ra=40 kohm); Unit No.2 (low-mu, pins 2/3/6) is a power triode (mu=5.4, ra=750 ohm, Pa_max=11W).
Novar base (Small-Button Novar 9-Pin, JEDEC No. E9-75). Not to be confused with Noval or Octal base types.
13GF7 is the series-string heater equivalent (13V heater). Not interchangeable without heater supply modification.
The heater current is 0.985A, slightly higher than the 0.9A or 0.925A of similar types.
Pin 7 has no internal connection.
Peak heater-cathode voltage must not exceed 200V. The DC component must not exceed 100V.