22DE4

Rectifier — Octal

Tung-Sol

Known Equivalents & Substitutes

No known equivalents. If you know of any, use the ⚑ Report Issue button above.

Similar Tubes (Not Drop-In Compatible)

17DE4

Identical except 16.8V heater — not a drop-in due to different heater voltage

Same function (half-wave Octal damper diode) but lower PIV (4400V vs 5500V) and different heater voltage

Identical except 6.3V heater — not a drop-in due to different heater voltage

Electrical Specifications

Absolute Maximum

Anode Dissipation (max)Plate Dissipation (max)6.5W

Heater-to-Cathode Voltage (max)Peak Heater-Cathode Voltage (heater negative)5,500V

Rectifier

Peak Inverse VoltagePeak Inverse Plate Voltage5,500V

DC Output Current (max)DC Plate Current (max)180mA

Peak Anode Current (surge)

Heater

Heater VoltageHeater Voltage22.4V

Heater CurrentHeater Current0.45A

Notes

Tung-Sol datasheet, December 1, 1962, Plate #6347. JEDEC Group 1, B5-85 glass bulb, short intermediate-shell 5-pin Octal with external barriers.
Pins 1, 4, and 6 are omitted. Pin 2 is an internal connection — do not use as a tie point.
PIV rating of 5500V applies for operation in a 525-line, 30-frame system per FCC standards; duty cycle of voltage pulse must not exceed 15% of one scanning cycle.
Heater-cathode voltage: heater negative max 5500V peak (DC component must not exceed 900V); heater positive max 300V peak (DC component must not exceed 100V).
Heater warm-up time approximately 11.0 seconds (series-string operation).
Interelectrode capacitances (without external shield): plate-to-heater-and-cathode 8.5 pF, cathode-to-heater-and-plate 11.5 pF, heater-to-cathode 4 pF.

Pin Layout — Octal

2Internal Connection — Do Not Use

3Cathode

5Plate (Anode)

7Heater

Socket-Compatible Tubes ⚠ Not electrically compatible

References

Peak Plate Current

1,100mA

Heater