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Some Type H's use a [[Turret attenuators|turret attenuator]]. | Some Type H's use a [[Turret attenuators|turret attenuator]]. | ||
Type 53/54H was introduced in 1958, along with the [[533]] and [[543]], renamed Type H in 1959, and dropped after 1970. | Type 53/54H was [[introduced in 1958]], along with the [[533]] and [[543]], renamed Type H in 1959, and dropped after 1970. | ||
* http://w140.com/tek_fcp/tek_type_h_factory_cal_proc.pdf | * http://w140.com/tek_fcp/tek_type_h_factory_cal_proc.pdf | ||