Re: 453 blows HV fuse

Roger Evans

Isn't it normal for the trace to be distorted with the beam finder? The beam finder applies a fairly hard clipping to X and Y amplifiers to keep the spot on screen.

When you say there is something arcing in the HV box can you see the arc? The high voltage capacitors (C906, C976, C952, C954, C953, C961) are all likely points of failure in a scope of this age. I had to replace two of the 2.5kV rated capacitors in a 454 but they only showed any sign of leakage with a 1kV insulation tester so low voltage testing will not reliably find high voltage faults.


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