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The nomenclature I will be using is what is on the face of the front
panel. For instance, the label on the front panel is in capital letters
and continued in lower case to point out the function.

The most significant change between the 465 and the 465B is the way the
delayed sweep is handled. On the 465, when you are in the MIX
HORIZONTAL DISPLAY mode, the trace starts at the A TIME/DIV rate and
continues until the trace reaches the point set on the DELAY TIME
POSITION control. At that time the trace is swept the remainder of the
10 DIV trace width at the B TIME/DIV setting. This means that if you
have the DELAY TIME POSITION control set at 8.0 then you will only see
the B portion of the trace for 2.0 DIVisions.

On the 465B the trace also starts at the A TIME/DIV setting and when it
reaches the point set on the DELAY TIME POSITION the intensified portion
of the A trace is swept out over the entire 10 DIV on a separate trace
at the speed set on the B TIME/DIV setting. This second trace can be
moved above, on top of, or below the original A trace by rotating the
TRACE SEParation control when the HORIZontal DISPLAY is in the ALT
mode. The TRACE SEParation control is new on the 465B, it is not
present on the 465. This is a very significant improvement as you can
now view the intensified portion of the A trace over the entire 10 DIV
on the CRT.

Other upgrades are the use of LED in place of the incandescent or neon
bulbs on the VOLTS/DIV (4 LED's), UNCAL (3 LED's), X10 MAG, READY,
TRIGgered and POWER.

The 465 uses pushbutton knobs with the legends on the surface. These
legends have a tendency to wear off after prolonged use and you are left
with a nameless control. The 465B uses smaller pushbutton knobs that
are labeled on the front panel, not on the pushbutton surface. You are
never left with a nameless control.

The 465 used a coarse and fine HORIZontal POSition control. This dual
concentric control stuck out in front of the front panel and was in such
a position that it could be damaged rather easily. The 465B also uses a
fine and coarse HORIZontal control but it is in one potentiometer with
one control shaft and is a definite improvement.

The 465 used a rather complicated arrangement of fixed attenuators in
the input vertical circuit for the X1 and X2 attenuators. The X10 and
X100 used the plug in hybrid circuits. The 465B uses the plug in hybrid
attenuator circuits in all four attenuator positions, a definite
improvement.

The circuit boards have been redesigned on the 465B and numerous small
changes have been incorporated into the design to improve reliability,
flexibility and ease of repair. Boards from a 465 will not fit the 465B
and visa-versa although much of the circuitry is the same. The service
manuals are significantly different as new component labels are used on
the 465B which makes troubleshooting a bit easier.

Everything considered, if you are looking for a superior 100 MHz,
delayed trace oscilloscope you should choose the 465B over the 465 if
you have the option.

Reed Dickinson