From lines (3) and (4) above we can see that for the amplitron the chain noise output is primarily related to the noise generated per tube (line 4) and that for the klystron the noise is primarily determined by the input noise (line 3). Figure 4-45 is a tabulation of S/N levels at the output of each tube for a cascaded amplifier chain up to 100 tubes. In the case of the klystron, where the tube
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