Stan or Patricia Griffiths <w7ni@...>
Comments inserted below:
Terry Brown wrote:
Stan, I removed and reseated all the Nuvistors I could find and also checkedThat may be all that is required to fix the drift.
Are the 454's very sensitive to movement...i.e., do theNo, not normally. But you have to remember all 454's are now at least 30+ years old
and things like nuvistor sockets and transistor sockets can get a little oxidized
after that much time. Sometimes all that is required to fix an intermittant socket
is to remove and reinstall a transistor or nuvistor a couple of times.
I also noticed that the leading edges of the calibrator square waves have aYou may looking a the calibrator signal in the "AC" postion of the vertical input
coupling switches. (These are the horizontal lever switches near the input BNC
connectors.) Try the "DC" position and see if it doesn't look a little better.
The calibrator will look a little slanted in the AC position.
Glad to help, Terry. Let me know if I guessed this one right . . .
Thank you, again, for all your help and sharing of knowledge.