|C-1||250 pF, 4.5 kV||(Johnson 154-16)|
|C-2||1100 pF, 3 section||Jackson Bros LE-3-4595-380. (M Swedgal, 258 Broadway, N Y 10007)|
|C-3||500 pF, 2.5 kV mica||Sangamo H-5347|
|C-4||.001 uF, 5kV||Centralab 858S-1000|
|C-5, C-6||500 pF, 10 kV||TV "door knob" capacitor|
|C-7 thru C-10||.01uF, 600 V ceramic capacitor||(Centralab DD-103)|
|C-11, C-12||.01 uF 1.6 kV ceramic capacitor||(Centralab DD16-103)|
|C-13, C-14||.01 uF 600 V ceramic capacitor||(Centralab DD-103)|
|C-15 thru C-17||.01 uF, 1 kV mica Capacitor||(Sangamo H-2210)|
|RFC-1||50 uH||14 bifilar turns #10 AWG enamelled wire wound on ferrite core. Q-1 material, 5 inches long. 1/2 inch diameter (Permag Central Corp., 1213 Estes Avenue, Elk Grove Village. IL 60007; Catalog #S-206-Q1). Notch core with file and break to length|
|RFC-2||100 uH. 1 Adc||112 turns #26 AWG. spacewound wire diameter on 1" diam., 6" long ceramic from (Centralab X-3022H insulator). Series resonant with terminals shorted to 24.5 MHz|
|RFC-3||20 ohm, 50 Watt||wirewound resistor used as choke|
|RY-1||VOX operated SPST relay. Energized when transmit|
|PC-1. PC-2||Three 100 ohm 2W carbon resistors in parallel.||Three turns #14 AWG 1/2" diam 3/4" long in parallel with resistors. (Equivalent: Ohmite P-300 reduced to 3 turns)|
|J-1, J-2||Coaxial receptacle. UG-58A/U, for type N connector|
|T-6||5 V at 30 Amp||Chicago-Stancor P-4648|
|X-l, X-2||EIMAC SK 410 socket and EIMAC SK-406 chimney|
|B||Blower, 13 cubic feet at 0.2 inch back pressure||Use #3 impeller at 3100 rpm (Ripley 8472, Dayton 1C-180 or Redmond AK-2H-01AX)|
CATHODE CIRCUIT COMPONENTS:
|T-1 (10 meters)||0.l5 uH. 4 turns #14 AWG on 1/2"-inch form, 1/2-long. Parallel capacitance: 200 pF, 1 kV silver mica capacitor. Resonant at 28.7 MHz.|
|T-2 (15 meters)||0.l5 uH. same as T-1 Resonant at 21.3 MHz with 470 pF, 1 kV silver mica capacitor.|
|T-3 (20 meters)||0.31 uH. 6 turns #14 AWG on 1/2-inch form, 1/2-inch long, slug tuned (National XR-50). Resonant at 14.2 MHz with 470 pF, 1 kV silver mica capacitor.|
|T-4 (40 meters)||0.31 uH, same as T-3. Resonant at 7.2 MHz with 940 pF, (Two 470 pF 1 kV silver mica capacitors in parallel).|
|T-5 (80 meters)||1.3 uH, 13 turns #18 AWG on 1/2-inch diameter form. 1/2-inch long, slug turned (National XR 50). Resonant at 3.8 MHz with 940 pF. same as T-4.|
PLATE CIRCUIT COMPONENTS (for plate potential of 2500 Vdc). RL=1725 Ohm :
The 10, 15 and 20 meter inductor (L1) may be 10 1/2 turns #8 AWG copper wire (or 3/16" tubing) 2" diam., 3" long. Ten meter tap is 5 1/4 turns from plate end: 15 meter tap is 7 1/4 turns from plate end. The 40-80 meter coil (L2) may be 16 turns #10 AWG 2 1/2" diam., 4" long. 40 meter tap is 8 turns from junction with coil L-1.
|S-2||Single pole ceramic switch high voltage 30 ° index. Radio Switch Corp Model 86-A.|
|NOTE:||For additional data on plate circuit design, write for Amateur Service Bulletin #30, "Pi and Pi-L Networks for Linear Amplifier Service"|
|NOTE:||B- of power supply is floating and grounded only through plate meter M2 and the 50 ohm salety resistor. Cabinet of power supply should be grounded to amplifier cabinet as safety measure.|
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