22DE4 — Rectifier, Octal | Tubeofile | Tubeofile

22DE4

Name: 22DE4
Brand: Tung-Sol

Rectifier — Octal — Tung-Sol

Data: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.

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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

6AX4

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

6DE4

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

Voltage Drop (typical)Tube Voltage Drop (derived at Ib=180 mA DC)20V

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.
Tube voltage drop (Vdrop) is not stated as a discrete figure in the Tung-Sol datasheet. Derived from the Average Plate Characteristic curve (Ef=22.4V) at the maximum DC plate current of 180 mA, where plate voltage reads approximately 20 V.

Pin Layout — Octal

2Internal Connection — Do Not Use

3Cathode

5Plate (Anode)

7Heater

Socket-Compatible Tubes ⚠ Not electrically compatible

12D4 12SN7WGT 12SX7 13D1 1633 17AX4 19AU4 25AX4 5998 5C3S 5R4 5T4 5U4G 5V4 5Y3

References

https://frank.pocnet.net/sheets/127/2/22DE4.pdf