Chris Leary WA1KTZCell: (978) 973-2739

Radio Parts AvailableItem Description

ManufacturerModel

Number Specifications Comments

Commercial Grade HV Power Transformer

UTC CG-307 Secondary: 7000/6000/4800 VAC center-tapped @ 300 ma.Primary: 105/115/210/230 VAC

Was used in power supply for AM transmitter with 4-1000A modulated by a pair of 833As

Oil-filled Capacitor Aerovox 31 uF @ 9.5 kV Was used as power supply filter capacitor

Filter Choke UTC CG-100 12 Henry @ 150 ma. Was used as screen grid choke in AM Transmitter final amp

Audio Matching Transformer

UTC CVP-4 125 Watts, Output impedance 500, 200, 50,16, 8, 5, 3, 1.5 ohms. Primary impedance 3k,5k, 6k,8k,10k, 14k ohms, center tapped. 40 Hz – 10kHz

Was used to drive 833A Modulator

Modulation Transformer

UTC VM-4 300 Watts

SPDT Vacuum Relay Jennings RE-6B 25 kV @ 25 Amps Was used as high power antenna transmit/receive switching relay

DPDT Vacuum Relay Jennings RB-4 Was used as Linear amplifier in/out switching relay

Variable Capacitor E.F. Johnson 154-19Variable Roller Inductor

E.F. Johnson 226-2 22.5 uH Was used in Pi-network output of 4-1000A Final Amplifier

Variable Loading Capacitor

Cardwell Was used as loading capacitor in Pi-network output of 4-1000A Final Amplifier

Antenna Tuner Home-made N/A Matches 50/70 ohm Coax to balanced open wire transmission line

Operates 160 through 10 meters. Uses Butterfly Capacitor and very large edge-wound copper coil. 2 kW or more power handling capability.

High Power Modulator Home-made N/A Pair of 833As in Class B audio amplifier, 800 Watts output

Was used to modulate Kilowatt 4-1000A Class C final amplifier

Filter Choke Kenyon Transformer Company

T-181

High Power DPDT Latching Contactor

E.F. Johnson 145-102-13 Contacts rated at 17 kV @ 30 Amps

Vibroplex Bug Vibroplex Company

Serial Noumber 199332