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Hi Mark,

If you check the archives here, and at TekScopes, you will find
several articles where I detailed the process using a CR-70. The
CR-7000 is the same, only better.

In the book that came with the CR-7000, there is a detailed discussion
of the process. There are also several papers on Sencore's website.

And, in the test book, you will see settings for several generic scope
tubes, such as the 5UP1. All scope tubes are basically the same.

The Sencore CR-70, and CR-7000 have a universal CRT adapter available.
Essentially, it is a bunch of micro grabber clips connected to the
Sencore's test cable. The heater is obvious, the cathode, too. The
control grid is the first electrode after the cathode, and the focus
grid is next in line. The gain test uses the cathode, control grid, and
the next anode in the line to run the gun as a triode.

The Sencore does its rejuvenation using the control grid as the anode
and draws much higher than normal current out of the cathode. To aid
in that process, the heater voltage is raised 50% over normal.

In case you are worried, the control grid on a CRT is nothing like the
grid on a triode. It is a metal cup with a hole in its center for the
beam to pass through.

Beware! HP heaters often use non-standard voltages, such as 4.8V.

-Chuck Harris

Mark wrote: