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Type 53/54H was [[introduced in 1958]], along with the [[533]] and [[543]], renamed Type H in 1959, | Type 53/54H was [[introduced in 1958]], along with the [[533]] and [[543]], renamed Type H in 1959, | ||
and dropped after 1970. | and dropped after 1970. | ||
==Internals== | |||
The input is switched via a Frequency compensated attenuator network which is controlled by the Vols/CM Switch. | |||
Input is then coupled to the paraphase amplifier or phase inverter made up of two [[12AU6]] pentode tubes - V3854 and 4854. | |||
This stage converts the input signal to a differential push-pull output. Output of this stage is thenn passed to the first cathode follower, made with a pair of [[12AT7]] dual triode tubes V3863A and V3863B. The output from this cathode follower is thenn passed to the main amplifier made with a pair of [[12AU6]] pentodes, V3874 and V4874. The final output to the scope chassis is driven via final cathode follower with a pair of [[12AT7]] dual triode tubes, 3893A and 3893B, which drives pin 1 and 3 of the connector to drive the vertical amplifier inside the chassis. | |||
Heater for the tubes are derived from +75VDC heater supply available at pin 15 of the connector. This is to avoid any interference/hum from the regular AC heater supply at 60Hz. | |||
==Pictures== | ==Pictures== | ||