• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Nice little schematic drawing app w/ tube symbols

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It is pretty nice for quick schematics.

One thing is strange. It has a symbol for Dual Triode Filament Cathode (a directly heated dual-triode?), but there's no symbol for Triode Filament Cathode (a directly-heated triode like a 2A3 or a 45).


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Schemeit is good for drawing passive schematics. There's a not very functional sister to it, PartSim for basic simulations but with EasyEDA you get the lot.

It has some valve symbols and spice simulation models but it's a piece of cake to add your own symbols and PCB footprints - and import new spice models - so you can design, simulate and build things using EasyEDA.

You can even get your PCBs form EasyEDA if you like though - unlike some free PCB software - you are free to download and send the PCB Gerbers to any PCB fab you can find that can beat their prices!
 
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