http://bama.sbc.edu/
http://www.w7fg.com/index.html
http://www.agtannenbaum.com/
Whether or not your particular manual is listed may take a bit of searching....good luck Ken.
The manual for the Sencore PR57 can be found at:
http://bama.edebris.com/manuals/sencore/pr57/
It is in Adobe PDF format.
The Paco G30 manual can be found at:
http://bama.edebris.com/manuals/paco/g30/
This file is in LizardTech djvu format so you will need the djvu browser download or the standalone djvu program to view and print.
Radiodoc
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:I have a Sencore Powerite model pr 57 isolation instrument and a Paco model g-30 rf signal generator, but I do not have any manuals to these. Is there a place on the web or anywhere, where I can obtains manuals to these instruments...Thanks