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hmmm very odd, the pot checks out, you need to review the wiring and make sure nothing is shorting and all is hooked up correct. The washed out look is correct (degenerative feedback) the cap bypasses the cathode eliminating the degenerative feed back. this is a very simple circuit, should not be that hard to make work. IF you get the washed out pic AND you get the over contrast then the pot/cap have to be an issue.
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