Ian,
In the HP 8558B service manual, it looks like those switches are just assemblies of many different HP part numbers. I could be wrong. I've never looked at an 8558B. But I didn't notice a part number for an entire rotary switch assembly, except "Front Switch Assembly (Mechanical Parts)", HP part number 08558-60100, which includes all of the mechanical parts for the entire front panel switch(es) assembly.
Your BEST bet is probably to find an 8558B "parts unit" to get the parts from. You can probably find one on , eventually. Note that you can put an "auto-search" on eBay, so you'd be automatically emailed whenever anything matching your search came up for auction. Just go to "My Ebay", then "Favorites".
Darn! I just searched ebay, for "8558B", and then clicked on "Show Completed items", and it looks like an 8558B Front Panel Switch Assembly sold on Dec 15th, for $57.55. Maybe you could contact the buyer and see if you can get some parts from it, or maybe just get all the rest of it after he gets what he needs. You can go to and then click on the winning bidder's ID (kcands). You could also contact the seller, similarly, to see if they might have more of them, or the parts you need. (They are a test equipment dealer in Wyoming.)
Also, you could try asking Walter, at Sphere Research, at:
But, if you do need any HP part numbers for individual switch parts, such as rotor/contact assemblies, shafts, or whatever, I can look them up for you. You would need to be very specific about the locations of the parts, since the rotary switches' parts are not all interchangable.
I also have the full service manual available (362 pages in two manuals), on CD, at:
Good luck!
Regards,
Tom Gootee
tomg@...
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Message: 1
Date: Tue, 30 Dec 2003 11:39:01 +1000
From: "ian wells" <ianwells@...>
Subject: hp 8558b
Would anyone know where I can obtain the rotary switches on the front
panel of a HP8558B plugin?
thanks ian
