Re: HP 8566B - Can my high voltage transformer be faulty?
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Well I found the box of parts. I think they are most of a CRT retrofit kit for the 85662A, as the assemblies in the box mostly match those listed for the S/N 3004A and up variants. In these models, the HV multiplier is integral to the A1A3 HV board. Sounds like this is not what is needed for saevar's unit.
Dave Casey
Hi Don,
Wouldn't a shrunken display usually indicate that the HV was
too high, speeding up the electrons, and reducing how much the
electrostatic deflection system can deflect them?
That's how it works on conventional scopes...
-Chuck Harris
On Sat, 13 Jul 2024 00:31:43 -0500 "Don Bitters via "
<donbitters=[email protected]> wrote:
> I have replaced several in the 85662A many, many years ago. There are
> 2 types depending whether you have a long CRT (PN 5083-5791, IIRC),
> or a shorter CRT newer type dot raster scan CRT (Panasonic). The HV
> transformer is inside the metal box at the rear, left of the CRT
> (A1A6 circuit).? They usually fail open.? You should see a shrunk
> image on the CRT when the HV transformer fails, both horizontally and
> vertically, or a dim dot. You will still have a good display if you
> check the video and horizontal outputs on an oscilloscope.
>
> Don Bitters
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