The Tektronix Type 9A1 is a 24 MHz ("DC to 23Mc, not more than 3dB down at 24Mc") dual-trace amplifier for the 506.
The 9A1 uses a pair of 8233 pentodes to drive the CRT.
|Bandwidth||24 MHz (-3 dB)|
|Rise time||14.5 ns|
|Deflection||10 mV/Div to 10 V/Div, 1-2-5, variable up to ×2.5 (25 V/Div) min.|