HP 8657A magic smoke...

[Reprobate]

... For example, a Philips frequency counter that used a filter with wires emerging at right angles from the side, and there no way anything else with a filter will fit the space because the chassis practically touched the bare end of the original.

That picture looks rather like a HP8904A to me. Luckily, a friend bought one of those, meaning I don't have to! Not exactly a high point in UI design

As mentioned, it was the HP 8904A that I replaced the IEC on last week - however, it uses a Schaffner FN 326-3/06 which is, like the one in your Philips kit, a right-angle exit type... you can just see the replacement at the far right of the photo...

Hello, new to the forum after I found your post, and also thank you for the documenting of what you did, the part numbers in the post led me right to the part I needed for my 8657B, I actually ordered the  FN370-2-22 instead of the  FN370-2-21 by mistake, but my luck would have it my fuse was in fact the 6.3x32mm out of the old unit (not included in new unit) so I just copied the old wiring and moved the cap over to my new unit, and it worked. Lucky that was all it was as when I saw that smoke I thought the worst, so again thanks very much for the documenting including the model number!

Now, I wanted to ask a favour, I saw you also had an option 2 unit like myself, and your outputs are at the back. I don't suppose you have more info on what I would need to do in order to move them to the front (at least the RF)? I have the 8657B but I saw you said it's a similar procedure?

Thanks again!