4-400A Transmitting Tube, Broadcast / Industrial -400 Watt Plate Dissipation (Max.) 4-400A/4-400C -MFR: Taylor The 4-400A and 4-400C are intended for use as amplifiers, oscillators or modulators.  The low grid-plate capacitance of these tetrodes couples with their low driving power requirement allow considerable simplification of the associated circuit and driver stage. They are cooled by radiation from the plate and by circulation of fo . . .

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4-400A Transmitting Tube, Broadcast / Industrial
-400 Watt Plate Dissipation (Max.) 4-400A/4-400C
-MFR: Taylor

The 4-400A and 4-400C are intended for use as amplifiers, oscillators or modulators.  The low grid-plate capacitance of these tetrodes couples with their low driving power requirement allow considerable simplification of the associated circuit and driver stage.

They are cooled by radiation from the plate and by circulation of forced-air through the base, around the envelope, and over the plate seal.  Cooling can be greatly simplified by using the SK410 Air System socket and its accompanying glass chimney.

Glass Tube with Metal anode.

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