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Serial number 101-8627 had an input amplifier, forward-terminated delay line, and an output amplifier driving the CRT deflection plates. At S/N 8628 this was replaced with one amplifier, reverse-terminated delay line, and CRT plates. In conversation, John Kobbe told me he had realized that the termination could absorb the reflection bump caused by the mis-terminated CRT plates. This innovation was applied to Type 545 development and no instruments were made with the old two-piece architecture.

User:Vintage dave, 16 Nov 2021