Stan or Patricia Griffiths <w7ni@...>
Hi stan, thanks for the website info. Stefan has kindly offered to photocopyMost scope problems, it seems, are in the power supplies. I would check the
power supplies to make sure they are still regulating when the problem shows up.
It would be helpful to know if both A and B sweeps stop at the same time or if it
is just one of them.
Channel A of the CA plug in does not match the voltage settings of CH B evenOn this problem, I would like to know if it appears that the gain is too low or
too high and which channel seems to have the problem? Is the same problem
evident in all setting of the volts/div switch or is it just one position?
Horizontal display selections other than B and B intensified by A onlySince the trace seems to be there only occasionally, it sounds related to the
first problem you mentioned.
The dull "cloudy" hue may be due to faceplate clouding on the CRT. Take a close
look at the pads cushioning the CRT inside of the shield at the faceplate. Are
these BLACK foam rubber or are they sort of orange-brown in color? If it is a
strip of black foam-like material, this is bad news and needs to be replaced with
different cushion material. There was a chemical reaction between the material
that bonds the plastic implosion shield to the front of the CRT and the black
cushion material that results in the bonding material in front of the CRT turning
cloudy. There is a cure for this and I can share more information with you about
it if the cushion materials are black or you thing the CRT faceplate bonding
material has become cloudy.
I have a tube tester & tested all tubes for quality and leakage & they allOK Stuart, we are started now and the 545B is certainly worth the trouble to