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4-250A

    https://frank.pocnet.net/sheets/140/4/4-250A.pdf
    4-250A EITEL-McCULLOUGH, SAN C AR LOS CAL I F C) INC. R NIA RADIAL-BEAM POWER TETRODE MODULATOR OSCILLATOR AMPLIFIER 6.38 inches 3.56 inches 8.0 ounces 2.0 pounds The Eimac 4-250A is a compact. ruggedly constructed power tetrode having a maximum plat. dissipation rating of 250 watts. It is intended for us. as an amplifier, oscillator or modulator.

4-250a amplifier of doom! : valveman — LiveJournal

    https://valveman.livejournal.com/4600.html
    Next, we need to power the filament of the 4-250a. While the 12AX7 and 7591 or EL34 will draw about 2 amps combined, the 4-250a's filament sucks a little over 14 amps at 5 volts! That's 70 freaking watts! I'd be happy to have just that in audio output! More than likely I'll buy a regulated switching supply for it.

Vacuum Tube - 4-250A / 5D22, Tetrode, Power Amplifier | CE ...

    https://www.cedist.com/products/vacuum-tube-4-250a-5d22-tetrode-power-amplifier
    Vacuum Tube - 4-250A / 5D22, Tetrode, Power Amplifier - The 4-250A / 5D22 is a compact, ruggedly constructed power tetrode having a maximum plate dissipation rating of 250 watts. It is intended for use as an amplifier, oscillator, or modulator.

Vacuum Tube - 4-250A / 5D22, Tetrode, Power Amplifier ...

    https://www.tubesandmore.com/products/vacuum-tube-4-250a-5d22-tetrode-power-amplifier
    The 4-250A / 5D22 is a compact, ruggedly constructed power tetrode having a maximum plate dissipation rating of 250 watts. It is intended for use as an amplifier, oscillator, or modulator.

big tube amp 250W push-pull 4-250a/5D22 tubes

    https://www.marchandelec.com/big-tube-amp.html
    We will show the BTA40 amp at the California Audio Show, July 2019 One 805A big tube in SE configuration 20WRMS, Class A. Voltage gain 36dB 8 Ohm load Monoblock. RCA input 5-Way binding posts output Internal universal power supply Solid hardwood base Dimensions of base12" x 20" x 4" . Weight 20 lbs

5D22 4-250A - PoC-Net

    https://frank.pocnet.net/sheets/140/5/5D22.pdf
    TECHNICAL DATA The EIMAC 5D22/4-250A is a compact, ruggedly constructed power tetrode having a maximum plate dissipation rating of 250 watts. It is in- tended for use as an amplifier, oscillator or modulator.

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