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tube by a 5 nF capacitor. This "cross-bootstrapping" extends the high-frequency response. | tube by a 5 nF capacitor. This "cross-bootstrapping" extends the high-frequency response. | ||
Although 1959 was the first year one could find a "Type A" in the catalog, the same | Although 1959 was the first year one could find a "Type A" in the catalog, the same instrument with earlier "Type 53/54A" | ||
instrument with earlier "Type 53/54A" nomenclature was in the August 1956 | nomenclature was in the August 1956 Short Form catalog, and its Type 53A ancestor was in the August 1954 catalog which | ||
Short Form catalog, and its Type 53A ancestor was in the August 1954 | introduced the first 500-series scopes, the [[531]] and the [[535]]. | ||
catalog which introduced the first 500-series scopes, the [[531]] and the [[535]]. | |||
Type 53A has only three tubes, no [[T-coil peaking|T-coils]] or cross-bootstrap, and a bandwidth of 10 MHz in the 530 mainframes. | Type 53A has only three tubes, no [[T-coil peaking|T-coils]] or cross-bootstrap, and a bandwidth of 10 MHz in the 530 mainframes. | ||
Catalogs don't list 53A performance in the 540 mainframes, but the Factory Cal Procedure says | Catalogs don't list 53A performance in the 540 mainframes, but the Factory Cal Procedure says 20 MHz. | ||
Type A was the first letter-series plug-in to be discontinued, in 1962. | Type A was the first letter-series plug-in to be discontinued, in 1962. | ||