ammeter

amplifier, general

amplifier, inverting

amplifier, operational

AND gate

antenna, balanced

antenna, general

antenna, loop

antenna, loop, multiturn

battery, electrochemical

capacitor, feedthrough

capacitor, fixed

capacitor, variable

capacitor, variable, split-rotor

capacitor, variable, split-stator

cathode, electron-tube, cold

cathode, electron-tube, directly heated

cathode, electron-tube, indirectly heated

cavity resonator

cell, electrochemical

circuit breaker

coaxial cable

crystal, piezoelectric

delay line

diac

diode, field-effect

diode, general

diode, Gunn

diode, light-emitting

diode, photosensitive

diode, PIN

diode, Schottky

diode, tunnel

diode, varactor

diode, Zener

directional coupler

directional wattmeter

exclusive-OR gate

female contact, general

Ferrite bead

filament, electron-tube

fuse

galvanometer

grid, electron-tube

ground, chassis

ground, earth

handset

headset, double

headset, single

headset, stereo

inductor, air core

inductor, air core, bifilar

inductor, air core, tapped

inductor, air core, variable

inductor, iron core

inductor, iron core, bifilar

inductor, iron core, tapped

inductor, iron core, variable

inductor, powdered-iron core

inductor, powdered-iron core, bifilar

inductor, powdered-iron core, tapped

inductor, powdered-iron core, variable

integrated circuit, general

jack, coaxial or phono

jack, phone, 2-conductor

jack, phone, 3-conductor

key, telegraph

lamp, incandescent

lamp, neon

male contact, general

meter, general

microammeter

microphone

microphone, directional

milliammeter

NAND gate

negative voltage connection

NOR gate

NOT gate

optoisolator

OR gate

outlet, 2-wire, nonpolarized

outlet, 2-wire, polarized

outlet, 3-wire

outlet, 234-volt

plate, electron-tube

plug, 2-wire, nonpolarized

plug, 2-wire, polarized

plug, 3-wire

plug, 234-volt

plug, coaxial or phono

plug, phone, 2-conductor

plug, phone, 3-conductor

positive voltage connection

potentiometer

probe, radio-frequency

rectifier, gas-filled

rectifier, high-vacuum

rectifier, semiconductor

rectifier, silicon-controlled

relay, double-pole, double-throw

relay, double-pole, single-throw

relay, single-pole, double-throw

relay, single-pole, single-throw

resistor, fixed

resistor, preset

resistor, tapped

resonator

rheostat

saturable reactor

signal generator

solar battery

solar cell

source, constant-current

source, constant-voltage

speaker

switch, double-pole, double-throw

switch, double-pole, rotary

switch, double-pole, single-throw

switch, momentary-contact

switch, silicon-controlled

switch, single-pole, double-throw

switch, single-pole, rotary

switch, single-pole, single-throw

terminals, general, balanced

terminals, general, unbalanced

test point

thermocouple

transformer, air core

transformer, air core, step-down

transformer, air core, step-up

transformer, air core, tapped primary

transformer, air core, tapped secondary

transformer, iron core

transformer, iron core, step-down

transformer, iron core, step-up

transformer, iron core, tapped primary

transformer, iron core, tapped secondary

transformer, powdered-iron core

transformer, powdered-iron core, step-down

transformer, powdered-iron core, step-up

transformer, powdered-iron core, tapped primary

transformer, powdered-iron core, tapped secondary

transistor, bipolar, NPN

transistor, bipolar, PNP

transistor, field-effect, N-channel

transistor, field-effect, P-channel

transistor, MOS field-effect, N-channel

transistor, MOS field-effect, P-channel

transistor, photosensitive, NPN

transistor, photosensitive, PNP

transistor, photosensitive, field-effect, N-channel

transistor, photosensitive, field-effect, P-channel

transistor, unijunction

triac

tube, diode

tube, heptode

tube, hexode

tube, pentode

tube, photosensitive

tube, tetrode

tube, triode

unspecified unit or component

voltmeter

wattmeter

waveguide, circular

waveguide, flexible

waveguide, rectangular

waveguide, twisted

wires, crossing. connected

wires, crossing, not connected