Difference between revisions of "H"

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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.
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 +
 +
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.
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==Pictures==
 
==Pictures==

Revision as of 10:34, 22 November 2019

Manuals – Specifications – Links – Pictures

The Tektronix Type H is a single-channel plug-in for 500-series scopes. It provides two inputs and has a switch to select between them. The rise time of the plug-in is 20 ns, bandwidth is 15 MHz. The sensitivity ranges from 5 mV/cm to 20 V/cm. A design compromise, Type H is not as fast as Type B, but it is DC-coupled on all ranges.

Later Type H models use a turret attenuator. Type H with S/N less than 10,000 have ordinary attenuators.

Type 53/54H was introduced in 1958, along with the 533 and 543, renamed Type H in 1959, 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