Tektronix 7S11 question

I already asked this in the TekScopes list on Yahoo, but so far no
one has stepped up to answer it there.

One of my 7S11s (SN B125nnn) appears to largely match the description
in the military service manual I downloaded from BAMA (even though it
is clearly a later unit than covered by that manual as the vertical
board is level 01 revision).

The other one has serial B102nnn, and has a different "dot response"
control. The pot has a switch detent in the fully CCW position and
there's a 10 turn pot mounted on a small piece of matrix board just
behind the control. There is an EC wire running from the matrix
board to the lower side of the toroid near the rear of the Vertical
board. I *think* that when the pot is turned into the detent, the
switch is actuated and the dot response setting is taken from the rear
mounted pot rather than the front panel control.

This particular unit was for many years the property of Tektronix
Sweden, and still has Tektronix Asset stickers.

Clearly this change will have an impact on the calibration procedure,
so I have a couple of questions:

1) Is this a normal production or service modification, or a "special"?

2) Would it be likely to be covered in the commercial manual? If so
are there any specific manual revision dates that I would need to make
sure that this is covered?

Thanks
Dave Partridge (remove xwy from replyto email address)


.

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