The Tektronix 7844 is a 400 MHz dual-beam CRT oscilloscope that takes two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins.
Versions include the 7844 bench-top lab scope and R7844 rack-mount model.
The 7844's CRT has distributed vertical deflection plates.
The power supply is a resonant switch-mode inverter with linear post-regulation, similar to the one in the 7904, unlike which the 7844 does have a fan.
- Tek 7844 page at amplifier.cd and a repair report (switch-mode PSU)
- Tek 7844 @ barrytech.com
- R7844 page with frequency response measurements