Quote:
Originally Posted by old_coot88
There's something else you could try in lieu of a bias box.
From that Test Point junction with R10, run a 10K resistor to ground. Add another resistor from the Test point to B+, using clip leads. Start with 2.2 meg for this resistor, working downward in value until the IF gain starts coming up. Find a value that gives good contrast without overloading. The regular AGC action will be largely disabled however.
With a constant level signal source, AGC might be less important than with over-the-air reception.
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I need a little explanation. In your last statement about a constant signal source, are your referring to my converter box? And the same thing as my RF converter from my DVD player?
Would doing this mod disable the contrast control?
How would I know when the IF starts to overload?
Sorry for all the questions but as you know I'm weak on the theory and how all the components work together.
When you say take the 10K resistor to ground, you mean my B- rail?
Thanks.