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I bought from a guy on eBay these 3 items.
I wanted a PG50xx for a while, and this one was reasonably priced. Still looking for a PG506 BTW.
He was also selling an AM503 along with a P6303. I already have an AM503, but he wouldn¡¯t sell them separately, so I bought both for 100€. I paid 160€ altogether with shipping for the 3 items.
He assured me that everything was fully functional. If this is the case, the probe alone is worth a bit more than that, and I figured I could always use the second AM503 enclosure to build the TM50x tester....
I would¡¯ve rather have a P6302 because it¡¯s smaller (and probably more fragile), but this will do just fine (especially since it was rather cheap compared to the crazy prices I see).
So I believe this was a good deal. What do you guys think?

Hello there

The AM503 are cheap and common, the AM503A and B far better.

Response of P6302 much higher BW than P6303.

P6302 and all small size current probes are easily damaged, the ferrite split core get hairline cracks even if dropped just a foot.

Thus, easy to get a defective unit on ¨¦pisode, most sellers will not or are incapable of testing.

PG506...wonderful cal set, hard to find a good one and as-is units can be hard to fix.

Bonsoir chance

Jon

On Wed, Feb 3, 2021 at 02:33 PM, Stephen wrote:

I figured I could always use the second AM503 enclosure to build the TM50x
tester....
So I believe this was a good deal. What do you guys think?

Although... as noted... the AM503 is "cheap" (cause it isn't always cheap) and plentiful... so was the dodo... until it wasn't.
I think you should save your second AM503 as a backup to your first... or to sell to someone on the forum who wants a backup for theirs... rather than destroy something you... or someone... may really need... to make something no one really needs.
That's my opinion... and I'm sticking to it.

On Wed, Feb 3, 2021 at 12:42 PM, Jean-Paul wrote:

Interleaved

Hello there

The AM503 are cheap and common, the AM503A and B far better.

Bonsoir Jean-Paul,

I¡¯m sure they are far better, but that¡¯s what I have.... so...

Response of P6302 much higher BW than P6303.

Yes. However, 99% of the time I only do audio tube stuff. So this is not really an issue. The 15Mhz BW of the P6303 is more than enough for me. And it¡¯s hopefully a little bit less prone to breakage than it tiny counterpart.
I hope everything will be working probably, though.

P6302 and all small size current probes are easily damaged, the ferrite split
core get hairline cracks even if dropped just a foot.

Thus, easy to get a defective unit on ¨¦pisode, most sellers will not or are
incapable of testing.

Since I¡¯ve never had any current probes myself, I wouldn¡¯t know how to test it properly.

PG506...wonderful cal set, hard to find a good one and as-is units can be hard
to fix.

Yep, I know... I¡¯ll keep looking...

Bonsoir chance

Jon

Merci ?

On Wed, Feb 3, 2021 at 01:21 PM, Roy Thistle wrote:

Although... as noted... the AM503 is "cheap" (cause it isn't always cheap) and
plentiful... so was the dodo... until it wasn't.
I think you should save your second AM503 as a backup to your first... or to
sell to someone on the forum who wants a backup for theirs... rather than
destroy something you... or someone... may really need... to make something no
one really needs.
That's my opinion... and I'm sticking to it.

I understand your point, and I¡¯m still debating what I¡¯ll do with it.
Maybe I¡¯ll end up making one good unit out of the 2... because I¡¯ve had this unit for a while now, but I don¡¯t even know if it¡¯s even worked, since I¡¯ve never had a current probe for it. That¡¯s why I bought this one in the first place. I was just originally looking for a probe.
I don¡¯t know at this point... I¡¯ll decide when the items arrive and see what the deal is....

Thanks Roy

Rebonjour Roy, for checking the probes, form a current loop of a BNC male and 51 Ohm 1/2 w resistor

Use a pulse gen, check low frequency response eg 1 kHz then HF eg 1 MHz

Most pulse gens can drive a 50 ohm load to 5V so you have a 100 mA peak test current.

A bad hall effect chip will have no DC response, cracked core will be way out of cal on DC or AC.

See the probe and amp specs and service manual for the performance check proceedure.

Definitely save the second AM503, rather than sacrifice to make a mainframes tester, since 1970s have had TM500 mainframes and plugins and very rarely needed to fix a mainframe,.

So the AM503 is much more useful than the tester.

Just the ramblings of an old retired EE

Bon soir¨¦e

Jon

PS are you in EU?

On Wed, Feb 3, 2021 at 02:14 PM, Jean-Paul wrote:

Interleaved.

Rebonjour Roy, for checking the probes, form a current loop of a BNC male and
51 Ohm 1/2 w resistor

You probably mean Stephen... Not Roy. ?

Use a pulse gen, check low frequency response eg 1 kHz then HF eg 1 MHz

I I¡¯ll do when I¡¯ll receive both.

Most pulse gens can drive a 50 ohm load to 5V so you have a 100 mA peak test
current.

A bad hall effect chip will have no DC response, cracked core will be way out
of cal on DC or AC.

See the probe and amp specs and service manual for the performance check
proceedure.

Definitely save the second AM503, rather than sacrifice to make a mainframes
tester, since 1970s have had TM500 mainframes and plugins and very rarely
needed to fix a mainframe,.

So the AM503 is much more useful than the tester.

Just the ramblings of an old retired EE

Bon soir¨¦e

Merci Jean-Paul. ?galement.

Jon

PS are you in EU?

Oui, ¨¤ Paris.