Awhile back someone on the LTspice List requested a TL598 Spice model.
While somewhat obsolete, it intrigued me, and proved to be somewhat of a !#$* to model... but it caused me to develop a few new functions in my behavioral modeling repertoire.
It can be found at TL598.zip on the Device Models & Subcircuits Page of my website... including an LTspice symbol.
Modeling is based only from information given in the datasheet and an ap-note... so it may be lacking.
As usual direct comments/questions/suggestions to the LTspice List or via the E-mail envelope icon on my Home Page.
Enjoy! (I hope ;-) ...Jim Thompson