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TINA/Spice: variable duty cycle square wave generator needed

Del Ventruella73
Prodigy 10 points
Other Parts Discussed in Thread: TINA-TI, LMC555

Tool/software: TINA-TI or Spice Models

Hi,

I need to replace an old rheostat from the 1930s that is no longer made.  It contains asbestos, so it can't be shipped and repaired. 

I was thinking that if I could build a variable duty cycle square wave generator, it would have the same effect as the rheostat.  I'd then run that output through an Op-Amp and to an SCR, and it would control the 250 V dc 300 Amp circuit. 

Does TI make a square wave generator with a frequency set by selection of a capacitor and the duty cycle set variable from 0% to 100% by a variable resistor?

Thanks.

Sincerely,

Del Ventruella