5D22

5D22 is also designated 4-250A.

The 5D22/4-250A is a radial beam power tetrode with a glass envelope, intended for use as an amplifier, oscillator, or modulator.

Construction and Cooling

The tube is cooled by radiation from the plate and by forced-air circulation through the base, around the envelope, and over the plate seal.

Ratings

The filament voltage is specified as 5.0 volts, with variations permitted only within the range of 4.75 to 5.25 volts. Absolute maximum ratings include a DC plate voltage of 4000 volts, a DC screen voltage of 600 volts, a DC plate current of 0.35 ampere, a plate dissipation of 250 watts, a screen dissipation of 35 watts, a grid dissipation of 10 watts, and a DC grid voltage of −500 volts.

Applications

In CW and audio applications, the plate-supply voltage should not exceed 4000 volts. For plate-modulated telephony service, the DC plate supply voltage should not exceed 3200 volts, and the DC bias voltage should not exceed 500 volts. In plate-modulated amplifier service, the maximum allowable carrier-condition plate dissipation is 165 watts; under 100% sinusoidal modulation, plate dissipation rises to 250 watts. The EIMAC datasheet recommends the 4PR400A for pulse service instead of the 5D22/4-250A.

Equivalence is asserted only where the archive's own literature states it directly, in at least 40 separate documents. Tubes that merely substitute in some circuits are not listed here.

Original manufacturer datasheets for 5D22, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• 4-250R (filed under 4-250A)
• $\frac{5D22}{4-250A}$

4 further designations appear alongside 5D22 in the literature but below the evidence threshold used here, so they are not listed as equivalent.