Hello again Raymond,
A few notes on the CAL and fast rise pulses.
1/ Tek service manual CAL procedure is vague in a few places, see the notes from Chuck Harris on tekscopes2.
2/ since 1980s, we designed and researched low jitter digital transmission and transformers.
The transient rise time is important but especially the aberrations, eg percent overshoot, ringing, etc.
The PG506 fast rise is OK, and older Tek fast pulse adapter (TD, Avalanche) and Jim Williams Lin Tech can be used.
My standard is the Leo Bodnar 40 pS pulser, fortunately have two of the BNC model, USB powered
10 MHz. Highly recommended!
To have best results, use no cables, buffer pulser output with a Mini-Circuits HAT-20 20 db 50 ohm BNC attenuator (to minimize reflections from VSWR of the scope input).
That setup has worked for 2465/7/B and also 1 ghz scopes and plugins like 7104/7A29, to optimize the vertical transient response.
Note that transient response tweaking is in steps of interacting adjustments, affecting different time scales. The procedure should be repeated a few time for optimal results.
Can post some photos if any interest.
Amicalement
Jon
Jean-Paul