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Hi,

I've a HP 1331A XY with a major fault being that this ribbon has begun
delaminating (a few inches from the end far from CRT) and arcs
dramatically - I am assuming because the insulator is now air and not
the laminated plastic.

Arcing point is just behind the bend in front here:


One trace is at 7.5kV post-accelerator potential (after the tripler),
and the other two appear to be storage mesh and collector mesh (+158v)
potentials. (Same ribbon was used in 1335A)

Has anyone successfully repaired one of these?

I'm thinking Corona Dope might be usable here. But it looks like
whatever adhesive was in the strip, is beginning to fail, potentially
along the entire length.

Any insights appreciated.

--Toby

Haaa I was thinking the same thing!

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

A kit made up of accessories that were acquired new from RF parts distributors and also over time before eBay sellers figured out how much excessive money they could extract from buyers.? Total cost around $200.
/g/HP-Agilent-Keysight-equipment/photo/68476/1?p=Name,,8405a,20,1,0,0

Greg

On 2020-12-02 2:19 a.m., tgerbic wrote:

Toby,

If the scan is from the HPArchive it is one of mine.? I think that one
was the first time I scanned it and is the 72 dpi scan to keep it small,
6.6Mb.? I have a more recent 300 dpi version at 28Mb that looks as
sharp/clear as the original manual.? Front cover is a bit faded so did
not turn out well in the scans.?

I can have it uploaded to the HPArchive but if you need it quickly, I
could put it in Dropbox.

That is great news!

Thanks for posting the original. It's much better than nothing, but I'm
really struggling a bit with details.

Thanks so much! I'm also looking for better copies, or paper copies, of
1350A, 1351A, 1347A manuals/docs if there's any chance they exist.

There is no rush at all, but I'd appreciate a note when you get it
uploaded to HPArchive. No need for DropBox, thankyou though.

--Toby

Regards

The accessory kit for the 8508A vector voltmeter is compatible with the 8405A probes. Along with various probe tip adapters it also contains replacement probe tips and a miniature nut driver to install those tips.

You need the probes to be intact on the 8405A as the probe heads contain the magic circuitry that makes the whole vector voltmeter work. An 8405A without probes is essentially useless.

There are accessories for the probes that convert to BNC (10218A) or a 50ohm tee with N connectors (11536A).

Trimming down my collection due to an out-of-state move.

Please contact me directly if interested. I am in the US.?

Thank you,
Wolfgang, KI7PFX

The 9122C is spoken for.
It will be picked up.

The other one is left. I shall try to decide
to whom, and how...

Ulf Kylenfall
SM6GXV

Toby,

If the scan is from the HPArchive it is one of mine.? I think that one was the first time I scanned it and is the 72 dpi scan to keep it small, 6.6Mb.? I have a more recent 300 dpi version at 28Mb that looks as sharp/clear as the original manual.? Front cover is a bit faded so did not turn out well in the scans.?

I can have it uploaded to the HPArchive but if you need it quickly, I could put it in Dropbox.

Regards

On Mon, Nov 30, 2020 at 06:39 AM, ghnatiuk@... wrote:

What do you consider expensive?
Be careful on EBAY -? make sure probe tips are not broken.

?

I have an 8405, which came with working probes whose tips were worn/broken down.

After looking around for a while I tried ordering a set of replacement tips made by ProbeMaster, intended for their oscilloscope probes.  Two sizes are available: 4981ST and 4882MT ("standard" and "micro"). The folks at ProbeMaster told me these have a 0-80 UNF thread, but didn't know if they would fit an 8405 probe.

They do, and they work.  They're not identical to the original tips;  the insulating bushing is of a larger diameter and it ends up snugging down against the end of the HP probe barrel rather than sliding inside. I don't think that's an issue as this probe position doesn't (I don't think) require a well-characterized transmission line impedance.  The thread is a good match for the probe, and the tips seem well-made and sturdy.

At $3.75 each plus shipping, I think they're a very workable alternative to buying new-old-stock HP spares (if you can find 'em) and are more convenient than having to stick an 0-80 screw into a lathe and shave it down to a point.

ProbeMaster also makes a BNC adapter, intended to fit over the end of one of their probes and convert it to a BNC male workalike, using the probe tip as the center pin.  These, alas, do not fit the 8405 probe - the diameter of the ground ring at the end of the probe is wrong.  It might be possible to make some sort of shim, but I haven't done so.

Posted this a while back but thought it might be worth asking again.

The online scan is very poor, would love to find a paper copy as I am
trying to restore one of these.

Thanks
--Toby

I thought I should close the loop on this. I have the 16702 software now on sd disk and it works well with the scsi2sd v6 installed in my HP16702A. I cloned the sd card with win32 image writer to have a back up. Works.
In case someone else needs the software on sd card for use with a scsi2sd I can get you the .img file that can be written to an empty sd card. I have used a 32GB card, so that is the size of the .img file, so I am not going to post it in the files section....

I can't figure out how to remove the heatsink.

Also, I briefly looked for this mother board on the Internet should I resort to replacing it and the prices are outrageous. Does a similar footprint mother board exist that may be lower cost?

Hi Noel
thanks very much for your help I will have a good look at the p/supply
Roy

Hello,

I have had issues with an HP8665A and this model which affected the power supply rails.? Both came down to failures of tantalum capacitors in various modules.? The first was easy because there was a visual indication of failure caused by the explosion of the capacitor before it shorted out the supply.? The others I just tracked down as DC shorts on the rails.

It may have nothing to do with your issues but it would pay to check the supply rails and also to let you know that there is a switch you must use to put the unit in service mode but you really need to refer to the manual.

SEE for example the hard copy version and title at??

But I found a pdf on the web.

regards Noel VK3NH (Melbourne - Australia)