Quote:
Originally Posted by Penthode
Look at it this way. This set is designed to include a two stage DC coupled video amplifier. Let's go back to basics: why is there a two stage DC coupled amplifier? Next to provide the two stage DC amplifier, the two stages have to be DC stacked. With regards to the cathode and control grid, the plate is roughly at +120vdc. So to DC couple the two stages, the first stage grid/cathode is at about -120vdc, the plate of the first stage is DC coupled to the second stage grid/ cathose at around 0vdc and the plate of the second stage is coupled to the grid of the picture tube at around +120vdc. This is to couple the DC component. Do you understand this?
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Can we take this description a concept at a time. The 12AU7 contains the 2 stages of video amplification. This 2 stage, DC coupled amplification happens here? I don't know what coupled refers to here...the 2 stacked DC voltages?