[Amps] ALC setup

["Steve Flood" <kk7uv@bresnan.net>]

I am putting together a simple ALC circuit for my homebrew amp and TS870.  The 
ALC circuit is found in Orr, K8RA Hanbook amp, K5DR webpage, etc.  It uses a 
capacitive divider off the RF input line and a variable DC supply.   My TS870 
requires a -6 to -20v range for ALC adjustment as per the manual.  So I'm 
having some trouble figuring out what capacitor values I need in the divider.  
I tried this in SPICE but cannot get the modeled circuit to generate negative 
voltage.

Thanks, 
Steve KK7UV
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