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Eimac

3-500Z Amplifier

From brochure the by Eimac

TYPICAL CATHODE DRIVEN (GROUNDED GRID) AMPLIFIER CIRCUIT FOR TWO 3-500Z TUBES

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)
M-1 500 mAdc
M-2 1000 mAdc
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.


ALL CREDIT TO THE USEFULNESS OF THIS (Formatting, data, etc..) goes to the original author: Kvindesland

Other references:

Eimac is available at http://www.eimac.com/.

3-500Z is now produced by Triton Services, Inc of Dunkirk, MD USA. They may be contacted at Triton Electron Technology Division, 3100 Charlotte Avenue, Easton, PA 18042. Phone - 610 252-7331, FAX - 610 258-6279.):

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