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Tektronix Type CA
24 MHz dual-channel amplifier
Type CA front view

Compatible with 500-series scopes

Produced from 1959 to 1973


Manuals – Specifications – Links – Pictures

The Tektronix Type CA is the most common plug-in for 500-series scopes – over 50,000 were produced.

Type CA is an enhancement over its predecessor, Type 53/54C, adding ADDED mode to the A, B, CHOPPED, ALT repertoire. The "A" in "CA" stands not only for the fact that it is a modified, enhanced replacement, but also because the feature added was "ADDED".

Type CA was introduced in 1959 and discontinued in 1973, making it not only the most-produced but also one of the longest-lived.

Late versions have BNC connectors instead of UHF connectors.

Lavoie Laboratories produced an unauthorized clone, the Lavoie LA-265-CA.

Key Specifications

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The risetime of a Type 545 oscilloscope with a Type CA plug-in is 15 nanoseconds, and the bandwidth is 24 MHz. Maximum vertical sensitivity is 50 mV/div.


Some Parts used in the CA

Page Class Description Used in
6AK5 Vacuum Tube (Pentode) RF pentode B C CA G K L S Z 517
6AU6 Vacuum Tube (Pentode) RF pentode 107 181 310 502 502A 512 513 531 531A 535 545 545A 546 547 549 555 575 581 581A 585 585A C CA Q