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Phase change when adding gain stage?
Phase change when adding gain stage?
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Old 15th May 2009, 10:40 AM   #1
bereanbill is offline bereanbill  United States
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Question Phase change when adding gain stage?

I want to add a gain stage to an amplifier by using 1/2 of a dual triode originally used as a second input. This will put the signal 180 degrees out of phase will it not ? Will I need to reverse the plate leads on the OT?
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Old 15th May 2009, 08:20 PM   #2
ray_moth is offline ray_moth  Indonesia
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Assuming that the stage you want to add will be a grounded cathode stage then, yes, it will invert the phase. However, you only need to reverse the connections to the OPT if the added stage will be within a global NFB loop, to prevent the FB from becoming positive..
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