1 500-W Rf Amplifier

Posted on Jul 13, 2012

The frequency range of this amplifier is 1.8 to 54 MHz. The amount of RF drive required for full output is about 30 W.

1 500-W Rf Amplifier
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The grid compartment (Rl, R2, RFC4, RFC5) should be shielded from the other circuitry—especially the output circuitry. C1,2—0.01 silver mica transmitting capacitor C3—1500 pF screen grid bypass (internal to tube socket) ca—2000 pF, 5 kV, two 858S capacitors in parallel, Centralab C5—Vacuum variable, 10 to 300 pF, 10 kV, Jennings UCS-300 (plate tuning) C6—-300 pF. 5 kV, Centra lab-type 858S C7—Vacuum variable, 3000 pF maximum, 3 kV, Jennings UCSL-3000 (loading) C8—0.0014 ftF, 10 kV (EM) C9—0.005 ftF, 15 kV oil capacitor C10,11 —500 pF. 20 kV ""TV doorknob," Centralab C12—0.05 pF, 20 Afeedthrough, Sprague C13,14,15—1000 pF feedthrough C16—0.1 /iF, 100 volts DC disc ceramic D1—Silicon diode, 1N4148 or 1N914 F1—3 A fuse J1—BNC chassis mount J2— chassis mount J3—HN chassis mount, used with RG213 for 3 kV feed J4—Chassis-mount AC outlet, Amphenol 160-2, AL part no. 713-5202 Lamp—No. 47 6.3 volt lamp L1 —3.5 turns no. 10 silver-plated wire, 1 inch ID, 2 inches long, self-supporting L2—24 roller inductor, Johnson 226-1 (EM, CC) M1—1 mA DC meter movement, filament voltage R1 —50 ohm, 60 watt noninductive resistor, thirty 1500 ohm 2 watt carbon composition resistors connected in parallel (see text) R2—1000 ohm, 2 watt carbon composition R3—100 ohm, 2 watt carbon composition R4—220 K, 2 watt carbon composition R5—25 ohm, 25 watt wirewound adjustable R6—1000 ohm, 2 watt carbon or wirewound pot R7—10,000 ohm, 2 watt carbon composition RFC1 —28 turns no. 18 wire solenoid wound on 0.5 inch OD by 2.5 inch ceramic form (plate choke) RFC2—Plate choke, surplus part (suggest B&W801) RFC3—74 turns no. 20 wire solenoid wound on 0.75 OD by 3 inch ceramic form RFC4—9 15 A RF choke, surplus part (suggest Dale no. IH15, HF no. 18-105) RFC5—1.0 mH RF choke RFC6—10 H, 1 A RF choke RT1—Surgistor, GC 25-933-S S1 —Air flow switch, Rotron 2A-1350 SK1 —Eimac socket, Sk-810B; chimney SK-806 (BY) T1 —Transformer, 6.3 volts AC at 10 A second— ary, Thordarson 21F12, AL 704-2019 Z1 —Zener diode, 6.2 volts, 1N473

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