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Vacuum tubes
Vacuum tubes, tube triode, tube tetrode, tube pentode, tube diode, BOOKS
The vector stencils library "Design elements - Electron tubes " contains 36 element A device with two active elements is a diode , usually used for rectification.
Semiconductor diode symbols
Semiconductor diode symbols, zener diode, varactor, capacitive diode, tunnel diode, photo-diode, photosensitive diode, four layer diode, diode, semiconductor diode, semiconductor rectifier diode, metallic rectifier, breakdown diode, uni-directional, breakdown diode, bi-directional, backward diode, unitunnel diode, LED, light emitting diode, BOOKS
A vacuum tube diode has two electrodes, a plate (anode) and a heated cathode. [ Diode . Wikipedia] The shapes example "Design elements - Semiconductor 
Diode, directly heated
Diode, directly heated, tube diode, BOOKS
The vector stencils library "Electron tubes " contains 36 element symbols of electron tubes . Use it for Diode , envelope, indirect. heated, tube diode ,. Triode  
EL34 shemathics
EL34 shemathics, tube triode, tube pentode, transformer, magnetic-core, terminal, switch point, junction, fixed resistor, resistor, fixed capacitor, capacitor, direction, flow, transmission path, chassis, frame ground connection, BOOKS
The simplest vacuum tube , the diode , contains only two elements ; current can only Wikipedia] "The EL34 is a thermionic valve or vacuum tube of the power 
Logic gate symbols
Logic gate symbols, operational amplifier, gate, open-collector output, gate, Schmitt trigger input, buffer, OR gate, Norton opamp, Norton operational amplifier, NOT gate, inverter, NOR gate, NOT OR, NAND gate, NOT AND, EX-OR gate, exclusive-OR gate, EX-NOR gate, exclusive-NOR gate, AND gate, BOOKS
"To build a functionally complete logic system, relays, valves (vacuum tubes ), Unlike simple diode logic gates (which do not have a gain element ), RTL gates 
Semiconductor elements
Semiconductor elements, turn-off triode, thyristor, turn off rectifier, gate turn off rectifier, triac, thyristor, bi-directional triode-type, gated switch, thyristor, diac, controlled switch, thyristor, reverse-blocking tetrode-type, semiconductor controlled switch, controlled rectifier, thyristor, reverse-blocking triode-type, semiconductor controlled rectifier, BOOKS
Semiconductor devices have replaced thermionic devices (vacuum tubes ) in most stencils library "Semiconductors" contains 22 symbols of rectifiers, diodes ,