The following four pages are the Hallicrafters' Service Bulletin 1951-30 which describes the installation of a shunt type noise limiter and the installation of a crystal calibrator and a panadapter connection. The bulletin is from August 6, 1951. Quality is not too great because the original was printed on yellow paper and this scan was of a copy (on white paper) of the original. By making this Service Bulletin available it should not be inferred that we advocate the installation of these modifications.

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