The EIMAC 8438/4-400A is a compact, ruggedly constructed power tetrode having a maximum plate dissipation rating of 400 watts. It is in- tended for use as an amplifier, oscillator or …

The Eimac 8438/4-400A is a compact, ruggedly constructed power tetrode having a maximum plate dissipa tion rating of 400 watts. It Is intended for use as an amplifier, oscillator or modulator.

The 4-400A / QB4/1100GA / RS 1002 A is intended for use as amplifier, oscillator or modulator. The low grid-plate capacitance of this tetrode couples with the low driving power requirement …

Jan 1, 2021 · My first homebrew plate modulated rig ran a single 4-400A, plate modulated by a pair of 833As. I ran the 4-400A at 2750 VDC at around 275 Ma Ip, for about 750 watts plate …

These 4-400A Eimac transmiting tubes are low hour pullouts, removed from working equipment. Clean Used * No longer available for export MFR: Eimac * Made in USA

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 …

A 4-400A amplifier for c.w., s.s.b. or a.m. Something different in high-power tank circuits. How long since you've seen a kilowatt pi network that didn't use a commercial rotary or switched …

Tube 4-400A or Röhre 4-400A ID21383, Transmitting Tetrode, air cooled, SPECIAL TUBEBASE in general and VHF shown. Radio tubes are valves.

Richardson Electronics provides power grid & microwave tubes. We have custom-engineered solutions for your needs. Check out 4-400A/8438 today!

All NOS tubes types for home audio and guitar amplifiers. * 30 Day Rock Solid Warranty on ALL NOS Tubes! We test your order before shipment for world class performance and the best …