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There is a similar sister model, the [[504]], with single-ended inputs. A rack-mount version, the ''RM503'', | There is a similar sister model, the [[504]], with single-ended inputs. A rack-mount version, the ''RM503'', | ||
was also available. | was also available. | ||
The 503 was $625 in 1960 versus, for example, $1000 for the [[516]] in 1960. | |||
Due to is its low bandwidth, the 503 can operate at high sensitivities while not responding to interference from | Due to is its low bandwidth, the 503 can operate at high sensitivities while not responding to interference from |