LTspice. How to...

How do I get ground in LTspice?

Add ground – Press “G” or click the ground button and click on the schematic to add a ground. Press “esc” to quit adding grounds. Label a net – Press “F4” or click the add net button. Type the name of the net and click “OK”.

https://eecs.oregonstate.edu/education/docs/tutorials/LTSpiceIntro.pdf
https://www.duncanamps.com/technical/ltspice.html

Symbols & models

You need an ASY file and an INC file which you download and put in the "Special Functions" directory of LTSpice. (you can put them anywhere but this one makes it easy to find them.) c:\Program Files\LTC\LTspiceIV\lib\sym\SpecialFunctions\ To use them, you can choose the diagram from the ASY file by going to the "Special Functions" components. Then you have to include a Spice directive (under "edit" on the main screen for LTSpice). You type .inc name-of-file Or you can just copy the whole contents of the INC file and paste it into the spice directive.

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OK so you want to install a collection of tube models and their supporting symbols. Note both are provided with no warranty implied or otherwise.

There are two directories you need to locate. LTspice is a 32 bit program and will be installed in program files in xp or Program Files (X86) in Win 7. Locate the LTC folder..

Path to tube symbols is \LTC\LTspiceIV\lib\sym - unzip the tube_sym zip and paste the folder here.

Next step:

Path to tube library is \LTC\LTspiceIV\lib\sub - unzip the tube_lib zip file and paste the file here.

Start LTspice and under the component folder (AND gate on the menu) you will see a folder called 'Tubes' click on this and you will find diode, triode, tetrode, and pentode folders. Click on the folder of your choice and you will get a number of choices. I have lots of triode models and fewer pentodes, tetrodes, and diodes.

https://www.dropbox.com/s/3el2j4zp36lw2fe/tube_lib.zip

https://www.dropbox.com/s/iwa43rup7w16b6y/tubes_sym.zip