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I don't know about a quasar, but on RCA's its a pot on the back and on zenith its a pot on the front. Not designed to be user adj, so you may have to look for it. if working the range of adj will be from a completely snowed pic, to a blacked out distorted pic. The correct setting is to adj to were the pic just starts to lose sync (this is due to the signal starting to enter the clipping stage of the IF amp, thereby losing the sync pulse) then back off until pic steadies. The pic should increase in contrast as you approach this loss of sync stage. This setting will put you at the max gain. The increase in contrast will cause the overall pic to get darker.
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