Data: MediumMedium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
Indirectly heated regulator beam tetrode with near-identical operating characteristics (gm 13.5 vs 14 mA/V, Pa_max 28 vs 35W), but 12E1 has anode on top cap rather than base pin 3 — not pin-compatible without rewiring.
Electrical Specifications
Section 1 — Beam Tetrode
Absolute Maximum
Anode Voltage (max)Maximum Anode Voltage800V
Peak Anode Voltage (max)Maximum Peak Anode Voltage (scanning operation)1,500V
Screen Voltage (max)Maximum Screen Voltage300V
Anode Dissipation (max)Anode Dissipation (max)28W
Notes
Beam plates (pin 6) must be connected to cathode (pin 8) at the valve holder.
Designed for series or shunt regulator service in stabilised power supplies, intended for parallel operation of multiple tubes. The typical operating conditions (Va = Vg2 = 150V, Ia = 200 mA) reflect regulator use, not audio amplification.
Heater-to-cathode voltage limit is polarity-dependent: 350V with heater negative relative to cathode, 150V with heater positive. In floating-cathode regulator circuits, ensure the heater is wired negative.
Triode-connected characteristic curves are published in the datasheet (pages 6–7), but gm and ra are not explicitly stated. The similar 12E1 shows triode gm ≈ 9.5 mA/V and ra ≈ 600 Ω at comparable operating points.
Special shock-resistant construction: rated for 2 g continuous acceleration and 500 g short-duration shock, intended for military or airborne applications.