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Old 7th Feb 2019, 1:20 am   #29
Uncle Bulgaria
Join Date: May 2016
Location: Cornwall, UK.
Posts: 342
Default Re: Ferrograph 4A: Restoration advice needed

Thanks again, Lawrence! Yet another PDF to add to my 'very useful' folder. I see the point of the calculation is to make sure the inrush current is limited, so it looks like all is in order now that I have the correct primary to meter. I'll take some more readings when I power it up, of course. It's good to feel one is gradually getting a handle on the hows and whys of a circuit.

Question to the floor - is there any idea of how the base comes off that head, or is it to be re-lapped with it in situ, off the edge of the lapping plate, perhaps?
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